To be at the end of one's rope

Origin

Imagine a tethered animal—a goat, perhaps, or a dog—secured by a rope to a stake in the ground. It can wander, graze, and explore, but only within the exact radius allowed by its tether. When it reaches the very end of that rope, it can go no further; its freedom is gone, its options exhausted, its movement physically curtailed. This vivid, confined image of an animal at its absolute limit gave birth to the phrase. By the 19th century, it was commonly applied to humans, perfectly capturing the desperate feeling of having reached the utmost boundary of one's patience, resources, or endurance, with no room left to maneuver.