have a screw loose
American Heritage Dictionary of Idioms:
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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]
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have a screw loose
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American Heritage Dictionary of Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.
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