the final nail in the coffin

US /ðə ˈfaɪnl neɪl ɪn ðə ˈkɔfɪn/
UK /ðə ˈfaɪnl neɪl ɪn ðə ˈkɔfɪn/
"the final nail in the coffin" picture
1.

son çivi, son darbe

an event that causes the failure of something that had already been weakening

:
The company's latest scandal was the final nail in the coffin for its reputation.
Şirketin son skandalı, itibarının son çivisi oldu.
His decision to quit was the final nail in the coffin for the struggling project.
Onun ayrılma kararı, zor durumdaki proje için son çivi oldu.