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3. at wit's end

at wit's end

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at one's wit's end

Fig. at the limits of one's mental resources. I'm at my wit's end with this problem. I cannot figure it out. Tom could do no more. He was at his wit's end.

See also: end

at your wit's end

so upset that you do not know what to do I have a problem that has me at wit's end, and I'm hoping you can help.

See also: end