go off the deep end

US /ɡoʊ ɔf ðə diːp ɛnd/
UK /ɡoʊ ɔf ðə diːp ɛnd/
"go off the deep end" picture
1.

mengamuk, kehilangan akal, marah besar

to become very angry or emotional, or to start behaving in a crazy way

:
When he heard the news, he really went off the deep end.
Ketika dia mendengar berita itu, dia benar-benar mengamuk.
She tends to go off the deep end when she's stressed.
Dia cenderung mengamuk ketika dia stres.