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have a screw loose
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Idioms and Phrases
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]Advertisement
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
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