be at the end of (one's) tether
To be completely worn out, exasperated, or exhausted; to have no more patience, endurance, or energy left. The baby's been crying all morning, and I haven't slept properly in days! I'm just at the end of my tether! The bosses are at the end of their tethers with the way this project is moving, so they've decided to bring in some outside help. Daniel's been at the end of his tether for weeks now—he has seriously got to get a different job!
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.