the straw that breaks the camel's back
US /ðə strɔ ðæt breɪks ðə ˈkæm.əlz bæk/
UK /ðə strɔ ðæt breɪks ðə ˈkæm.əlz bæk/
1.
the final small problem or insult that causes someone to lose their patience or tolerance, even after enduring many previous difficulties
:
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His constant tardiness was annoying, but forgetting my birthday was the straw that broke the camel's back.
•
After weeks of stress, the broken printer was the straw that broke the camel's back, and she burst into tears.