at one's wit's end
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Also, at wits' end. Completely puzzled and perplexed, not knowing what to do. For example, I've tried every possible source without success, and now I'm at my wit's end. This idiom, which uses wit in the sense of “mental faculties,” appeared in Piers Ploughman (c. 1377).
QUIZ
QUIZ YOURSELF ON "IS" VS. "ARE"
"Is" it time for a new quiz? "Are" you ready? Then prove your excellent skills on using "is" vs. "are."
Question 1 of 7
IS and ARE are both forms of which verb?
Words nearby at one's wit's end
at one's door, at one's ease, at one's fingertips, at one's leisure, at one stroke, at one's wit's end, at one's word, at one time, at one time or another, atonic, atonic bladder
The American Heritage® Idioms Dictionary
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