the last straw 最后一根稻草;导火线;忍无可忍;最后的稻草

【例句】
It's rain again! That's the last straw.
又下雨了！真让人忍无可忍。

When he didn't come home that night, it was the last straw.
他那晚没回家，事情已让人忍无可忍了。