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lose one's mind

lose one's reason
. Go crazy, lose one's sanity, as in
I thought she'd lost her mind when she said she was going ice-fishing
, or
That assignment is enough to make me lose my reason
. The first expression dates from the late 1500s; the second employs
in the sense of “unimpaired mental faculties,” a usage dating from the late 1300s. Also see under
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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