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.
a gota d'água
the final small problem or insult that causes someone to lose their patience or tolerance, even after enduring many previous difficulties
:
•
His constant tardiness was annoying, but forgetting my birthday was the straw that broke the camel's back.
Seu atraso constante era irritante, mas esquecer meu aniversário foi a gota d'água.
•
After weeks of stress, the broken printer was the straw that broke the camel's back, and she burst into tears.
Após semanas de estresse, a impressora quebrada foi a gota d'água, e ela desabou em lágrimas.