last straw
and the straw that broke the camel's backthe final difficulty in a series; the last little burden or problem that causes everything to collapse. (From the image of a camel being loaded down with much weight. Finally, at some point, one more straw will be too much and the camel's back will break.) When our best player came down sick, that was the straw that broke the camel's back. We hoped to make the playoffs, but lost all the rest of our games. When she showed up late a third time, that was the straw that broke the camel's back. We had to fire her.