screw loose
The phrase "screw loose" is an idiomatic expression often used informally to describe someone who is acting strangely or irrationally.
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Definition
B2Informal Conversation
(informal, slang)To behave in an odd or unpredictable manner.
Example
- I think John has a screw loose; he's been talking to his plants all day.
B2Informal Conversation
(informal, slang)To show signs of mental instability or irrational behavior.
Example
- She must have a screw loose to believe that conspiracy theory.
Similar
Terms that have similar or relatively close meanings to "screw loose":
screw withscrewed upscrew upscrew backloose offset screwloose cannonscrew aroundscrew offtemper screwscrew youon the loosecut looseloosen uplet looseblow a gasketloose fishout of whacklose one's shitloose endloose changewing nutflip outmessed uplose one's mindflip one's lidlose it