the straw that break the camel's / donkey's back

/ðə stɹˈɔː ðat bɹˈeɪk ðə kˈaməlz dˈɒŋkɪz bˈak/

/ðə stɹˈɔː ðæt bɹˈeɪk ðə kˈæməlz dˈɑːŋkɪz bˈæk/

one of several difficulties happening after one another that finally makes it intolerable for someone to continue something

Examples

1. And this is kind of viewed as the one event that kind of-- the straw that breaks the camel's back, so to speak.

2. It had been a difficult week, so when the car broke down, it was the straw that broke the camel's back.

3. This was the straw that broke the camel's back.

4. This was it, the breaking point, the straw that broke the camel's back.