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Have a loose screw Meaning in English

expression

HAV-uh LOOS SKROO
HAV-uh LOOS SKROO

Definition

This is an informal way to say someone behaves strangely or might be a little bit crazy, as if their mind is not working quite right.

Usage & Nuances

This is informal and mildly humorous—used among friends, not in formal settings. Commonly used as "He/She has a loose screw" or "You have a loose screw." It usually suggests eccentricity, not serious mental illness. Don't use it to describe someone with serious psychological conditions.

Example Sentences

I think Tom has a loose screw because he talks to his plants every day.

basic

Mary must have a loose screw to wear a coat in summer.

basic

People say my uncle has a loose screw because he collects rubber ducks.

basic

You seriously have a loose screw if you think that's a good idea.

natural

Don't listen to him—he has a loose screw sometimes.

natural

My brother's always coming up with wild plans. I guess he just has a loose screw.

natural