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).
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In the UK, COTTON CANDY is more commonly known as…
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, atonicity
The American Heritage® Idioms Dictionary
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