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Showing results for lose one's marbles. Search instead for he's lost his marbles.
Synonyms

lose one's marbles

Idioms  

  1. see under have all one's buttons.

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.