at wits' end

(redirected from be at wits' end)
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at (one's) wit's end

In a state of distress that is reached when someone has no more patience. The baby's been crying for hours, and I'm at my wit's end! I'm already at my wit's end, so if this train gets delayed too, I'm going to scream.
See also: end

at (one's) wits' end

At the limit of one's mental resources; utterly at a loss.
See also: end