end of one's rope, at the

at the end of (one's) rope

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 rope! Daniel's been at the end of his rope for weeks now—he has seriously got to get a different job!
See also: end, of, rope

end of one's rope, at the

Also, at the end of one's tether. At the limits of one's resources, abilities, endurance, or patience. For example, If that loan doesn't come through, we'll be at the end of our rope, or The workmen are driving me crazy; I'm at the end of my tether. This expression alludes to a tied-up animal that can graze only as far as the rope (or tether) permits. [Late 1600s]
See also: end, of