have a screw loose

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have a loose screw

To be or seem particularly silly, eccentric, crazy, or mentally unstable. (Also written as "have a screw loose.") That guy on the corner must have a loose screw or something because he's been standing out there yelling obscenities at passersby all morning. My old Uncle Pete has a few loose screws, but he's a really nice guy. What the hell's the matter with you? Do you have a screw loose, or what?
See also: have, loose, screw

have a screw loose

To be or seem particularly silly, eccentric, crazy, or mentally unstable. (Also worded as "have a loose screw.") That guy on the corner must have a screw loose or something, because he's been standing out there yelling obscenities at passersby all morning. My old uncle Pete has a few screws loose, but he's a really nice guy.
See also: have, loose, screw

have a screw loose

 and have a loose screw; have got a screw loose
Inf. Fig. to be silly or eccentric. He's sort of strange. I think he's got a loose screw. Yes, he has a screw loose somewhere. He wears a heavy jacket in the middle of summer.
See also: have, loose, screw

have a screw loose

Be mentally unstable or eccentric, as in Anyone who approves that purchase must have a screw loose. This term likens a mental weakness to a machine in which a part is not securely fastened. An antonym is have one's head screwed on right; for example, She's very capable; she has her head screwed on right. [Slang; early 1800s]
See also: have, loose, screw

have one's head screwed on right

see under have a screw loose.
See also: have, head, on, right, screw

have a screw loose

INFORMAL
If someone has a screw loose, they are crazy. He must have a screw loose, spending that sort of money on a holiday! She looked at me as if I had a screw loose. Note: The image is of a piece of machinery that needs to be adjusted or repaired.
See also: have, loose, screw

have a loose screw

verb
See also: have, loose, screw

have a screw loose

and have a loose screw
tv. to be silly or eccentric. (Have got can replace have.) He’s sort of strange. I think he’s got a loose screw. You’re talking like you’ve got a screw loose or something.
See also: have, loose, screw

have a screw loose

Slang
To behave in an eccentric or mentally deranged manner.
See also: have, loose, screw