the straw that broke the camel's back

Translations
последняя капля, переполнившая чашу терпения
Losing that contract was the straw that broke the camel's back for the company.
Потеря этого контракта стала последней каплей, переполнившей чашу терпения для компании.
Definitions
A minor or trivial action that causes a large and often sudden reaction, typically because it is the last in a series of events that have built up to a breaking point.
Words
back

noun
обратная сторона
straw

noun
солома
break

verb
ломать