The last straw that broke the camel\'s back 壓垮駱駝的最後一根稻草

The last straw that broke the camel's back - A person can't bear one more problem or  difficulty.

 

Don't push him too far or the last straw may break the camel's back. 不要逼他逼得太厲害，否則他會受不了的。

After the heated argument , the wife knew it was the last straw. 經過一場激烈爭吵後，太太已經知道無法再忍受了。