Straw that broke the camel's back
压垮骆驼的最后一根稻草，指一系列微小挫折中最终导致崩溃的事件。
用于描述长期累积问题后的临界点事件。
例句
The missed deadline was the straw that broke the camel's back, and she finally quit.
典故来源
源自阿拉伯谚语，比喻骆驼虽能负重，但不断加稻草终会压垮它。