lose all one’s marbles

lose (one's) marbles

To be or become mentally deficient, incompetent, or deranged; to become of unsound mind. My poor grandmother started losing her marbles after she had a stroke. I've been so sleep deprived lately that it feels like I've lost my marbles!
See also: lose, marble
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

lose (all) one’s marbles

tv. to become crazy. (see also have all one’s marbles.) Have you lost all your marbles?
See also: all, lose, marble
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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