at the end of (one's) tether(redirected from at the end of their tether)
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at the end of (one's) tether
Completely worn out, exasperated, or exhausted; having 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'm at 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!