the end of (one's) tether

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Related to the end of tether: at the end of one's tether, end of my tether

the end of (one's) tether

A point of utter exhaustion or exasperation; a point or state at which one has no more patience, endurance, or energy left. Joshua started throwing a tantrum this afternoon, and with all the other things I have to get done, I've just reached the end of my tether! Daniel's been at the end of his tether for weeks now—he has seriously got to get a different job!
See also: end, of, tether