Idioms are common phrases people use to say things in a more colorful way. They help us explain ideas or feelings clearly. Sometimes, we use idioms to describe things that are not nice or even evil. These idioms show us how people might behave badly or cause trouble.
In this article, you’ll learn idioms about evil behavior. Understanding these idioms can help you recognize when someone is doing something wrong or unfair. We’ll also test your knowledge with a short True or False quiz to see how much you’ve learned. Let’s begin exploring idioms that describe evil actions in an easy and interesting way.
Idioms for Evil
1. Up to No Good
Meaning: Planning to do something wrong or bad.
For Example: The boys whispering near the lockers were probably up to no good. / Sarah knew her little brother was up to no good when he hid behind the sofa.
Alternatively: Jake looked around sneakily, obviously up to no good.
2. Bad Egg
Meaning: Someone who behaves badly or does harmful things.
For Example: Be careful hanging around with Mike; he’s a bad egg. / Everyone at school says Eric is a bad egg because he always gets into trouble.
Alternatively: Lucy didn’t want to invite Tom because he was known as a bad egg.
3. Rotten Apple
Meaning: A person who negatively influences others.
For Example: One rotten apple in the class can spoil the fun for everyone. / Jenny warned her friend about being friends with the rotten apple in their group.
Alternatively: Coach said that Kevin was acting like a rotten apple, upsetting the team.
4. Snake in the Grass
Meaning: A sneaky or untrustworthy person.
For Example: Don’t trust Harry; he’s a snake in the grass. / Mia found out her friend was actually a snake in the grass.
Alternatively: Nobody saw the snake in the grass until it was too late.
5. Black-Hearted
Meaning: Cruel or unkind.
For Example: Only a black-hearted person would bully others. / Her mean comments made people call her black-hearted.
Alternatively: A black-hearted villain tried to hurt the hero.
6. Crooked as a Dog’s Hind Leg
Meaning: Dishonest or corrupt.
For Example: The salesman was crooked as a dog’s hind leg, trying to trick people. / Politicians who lie can be crooked as a dog’s hind leg.
Alternatively: He didn’t trust the storekeeper because he was crooked as a dog’s hind leg.
7. Wolf in Sheep’s Clothing
Meaning: Someone dangerous pretending to be nice.
For Example: The new friend turned out to be a wolf in sheep’s clothing. / Beware of strangers who might be a wolf in sheep’s clothing.
Alternatively: Mom warned us about trusting wolves in sheep’s clothing.
8. Mean Streak
Meaning: A tendency to be mean or unkind.
For Example: She’s usually nice, but sometimes she shows a mean streak. / That bully has a real mean streak.
Alternatively: Even friendly pets can have a mean streak sometimes.
9. Stirring the Pot
Meaning: Causing trouble or arguments on purpose.
For Example: Olivia enjoys stirring the pot by spreading gossip. / Teachers don’t like students stirring the pot.
Alternatively: Stop stirring the pot or you’ll lose your friends.
10. Double-Cross
Meaning: To betray or trick someone.
For Example: Jack double-crossed his team during the game. / Mia felt hurt when she was double-crossed by her friend.
Alternatively: Spies in movies often double-cross each other.
11. Dirty Tricks
Meaning: Unfair or dishonest actions.
For Example: Winning by dirty tricks isn’t fair. / The team lost because of their opponent’s dirty tricks.
Alternatively: He tried dirty tricks to win the contest.
12. Underhanded
Meaning: Sneaky and dishonest.
For Example: It was underhanded to cheat on the test. / She discovered her friend’s underhanded plans.
Alternatively: They used underhanded methods to beat the other team.
13. Low Blow
Meaning: An unfair or cruel action.
For Example: Insulting someone’s family is a low blow. / That was a low blow, making fun of his mistakes.
Alternatively: Using someone’s weakness against them is always a low blow.
14. Dirty Laundry
Meaning: Embarrassing secrets or private information.
For Example: Don’t share the family’s dirty laundry with everyone. / Friends shouldn’t spread each other’s dirty laundry.
Alternatively: She was embarrassed when her dirty laundry was shared online.
15. Bad News
Meaning: Someone known for causing trouble.
For Example: Jason is bad news; stay away from him. / Everyone knew the group of teenagers was bad news.
Alternatively: Mom thinks that neighbor is bad news.
16. Play Dirty
Meaning: To cheat or use unfair methods.
For Example: The other team started to play dirty when losing. / She always plays dirty in board games.
Alternatively: Playing dirty might help you win, but you lose friends.
17. Sell Someone Out
Meaning: Betray or reveal someone’s secrets.
For Example: Tyler sold his friends out to the teacher. / Nobody liked how he sold them out to stay out of trouble.
Alternatively: Don’t sell your friends out; it isn’t loyal.
18. Shady Character
Meaning: A suspicious or dishonest person.
For Example: The man selling watches on the street looked like a shady character. / Parents warn their kids to avoid shady characters.
Alternatively: I saw a shady character hanging around our school.
19. Vicious Circle
Meaning: A situation that keeps getting worse.
For Example: Bullying creates a vicious circle of hurting others. / They couldn’t escape the vicious circle of lies.
Alternatively: Fighting can start a vicious circle of revenge.
20. Cold-Blooded
Meaning: Cruel and without sympathy.
For Example: The villain was cold-blooded and showed no mercy. / Only a cold-blooded person could be mean to animals.
Alternatively: His actions were cold-blooded and shocking.
21. Devil’s Advocate
Meaning: Someone who argues just to challenge others or stir debate.
For Example: Ava always plays devil’s advocate during class discussions. / He acted as devil’s advocate to make his friends argue.
Alternatively: Playing devil’s advocate can upset people.
22. Evil Eye
Meaning: A mean or angry look.
For Example: Mom gave me the evil eye for misbehaving. / He gave the evil eye to anyone who annoyed him.
Alternatively: I knew I was in trouble when Dad gave me the evil eye.
23. Kick Someone When They’re Down
Meaning: To hurt or criticize someone who is already suffering.
For Example: Making fun of him after he lost was kicking him when he was down. / Good friends don’t kick you when you’re down.
Alternatively: Kicking someone when they’re down is cruel.
24. Plotting Behind Someone’s Back
Meaning: Secretly planning against someone.
For Example: They were plotting behind her back to embarrass her. / No one likes a friend who plots behind your back.
Alternatively: He got caught plotting behind his friend’s back.
25. Twisted Mind
Meaning: Thinking in a strange or harmful way.
For Example: That scary movie character has a twisted mind. / Only a twisted mind would come up with that prank.
Alternatively: He showed his twisted mind by hurting animals.
26. Bite the Hand That Feeds You
Meaning: To hurt or mistreat someone who helps you.
For Example: He bit the hand that fed him by stealing from his grandma. / Sarah realized she bit the hand that fed her when she argued with her parents.
Alternatively: It’s unkind to bite the hand that feeds you.
27. Two-Faced
Meaning: Someone who acts nice but is mean behind your back.
For Example: Emma found out her friend was two-faced when she talked badly about her. / Don’t be two-faced if you want real friends.
Alternatively: Being two-faced causes people to lose trust.
28. Trouble-Maker
Meaning: A person who often causes problems or trouble.
For Example: That student is known as a trouble-maker at our school. / Jason was labeled a trouble-maker after breaking rules.
Alternatively: Every class has at least one trouble-maker.
29. Dark Side
Meaning: A bad or evil part of someone’s character.
For Example: The villain in the movie showed his dark side clearly. / She warned him not to let his dark side control him.
Alternatively: Even good people can have a dark side.
30. Heart of Stone
Meaning: Someone who does not feel sorry or kindness toward others.
For Example: A bully might seem to have a heart of stone. / People said the mean boss had a heart of stone.
Alternatively: You must have a heart of stone to ignore others’ suffering.
31. Black Sheep
Meaning: Someone who doesn’t fit in and may cause embarrassment.
For Example: Joe was the black sheep in his family because he always got into trouble. / Everyone called him the black sheep since he never followed rules.
Alternatively: Being the black sheep can make someone feel lonely.
32. Go Rogue
Meaning: To start behaving badly or breaking rules.
For Example: The teacher was upset when students went rogue during class. / The robot in the movie went rogue and caused chaos.
Alternatively: They went rogue and ruined the team’s project.
33. Hidden Agenda
Meaning: A secret plan that is selfish or harmful.
For Example: His nice words covered a hidden agenda. / They realized the charity had a hidden agenda.
Alternatively: Be careful; he always has a hidden agenda.
34. Out for Blood
Meaning: Wanting revenge or trying to harm someone.
For Example: After losing the game, the team was out for blood. / She seemed out for blood after the argument.
Alternatively: Losing made him angry, and he was out for blood.
35. Bad Blood
Meaning: Anger or hate between people.
For Example: There’s bad blood between those two students. / Old arguments left bad blood in the family.
Alternatively: They avoided each other because of bad blood.
36. Play with Fire
Meaning: Doing something dangerous that can cause trouble.
For Example: Telling lies is like playing with fire. / You’re playing with fire when you tease bigger kids.
Alternatively: Cheating on a test means playing with fire.
37. Dark Intentions
Meaning: Secret plans to harm someone or something.
For Example: The villain’s dark intentions were clear in the movie. / She worried about her friend’s dark intentions.
Alternatively: People with dark intentions usually get caught.
38. Blood Runs Cold
Meaning: Feeling very scared or frightened by something evil.
For Example: My blood ran cold hearing scary noises at night. / Seeing the shadow made his blood run cold.
Alternatively: Her blood ran cold when the bully approached.
39. Under Someone’s Thumb
Meaning: Controlled by someone in an unfair or harmful way.
For Example: He felt trapped under the bully’s thumb. / Nobody wants to live under someone’s thumb.
Alternatively: She was tired of being under her friend’s thumb.
40. Drag Someone’s Name Through the Mud
Meaning: To unfairly ruin someone’s reputation.
For Example: She dragged her friend’s name through the mud by spreading lies. / It’s wrong to drag someone’s name through the mud just because you’re angry.
Alternatively: After the rumor, his name was dragged through the mud.
True/False Quiz: Idioms for Evil
1. If someone is called a “bad egg,” it means they usually cause trouble.
True / False
2. “Stirring the pot” means helping friends get along better.
True / False
3. A person described as “two-faced” acts nice but talks badly about others.
True / False
4. “Playing with fire” means you are doing something dangerous or risky.
True / False
5. A “wolf in sheep’s clothing” is someone who looks mean but is actually friendly.
True / False
6. “Bad blood” means there is friendship and happiness between people.
True / False
7. If someone “double-crosses” you, they are loyal and trustworthy.
True / False
8. “Dirty laundry” refers to secrets or embarrassing things you don’t want others to know.
True / False
9. Having a “heart of stone” means being very kind and caring.
True / False
10. A “snake in the grass” is someone sneaky and untrustworthy.
True / False
Answers key
- True
- False
- True
- True
- False
- False
- False
- True
- False
- True
Scoring Guide
- 10 Correct Answers: Idioms Master!
- 7–9 Correct Answers: You really get Idioms nice work!
- 4–6 Correct Answers: You’re learning, keep going!
- 0–3 Correct Answers: Let’s learn about Idioms together!
Conclusion
Learning idioms about evil helps you understand how people sometimes describe bad or harmful actions. These idioms can teach you how to recognize trouble in everyday situations, such as at school, home, or while playing with friends. Understanding them also makes it easier to explain your feelings clearly.
Keep practicing and using these idioms in conversations. Soon you’ll notice how much better you are at spotting and describing tricky behaviors around you. Great job finishing this lesson!
