the straw that breaks the camel's back 壓倒駱駝的最後一根稻草

『壓倒駱駝的最後一根稻草』英文為the straw that breaks the camel's back

也常用過去式來表示，例如   That incident was the straw that broke the camel's back.

Camels can carry heavy loads over long distances, but they have their limits, too.