go sour

US /ɡoʊ ˈsaʊər/
UK /ɡoʊ ˈsaʊər/
"go sour" picture
1.

misgaan, zuur worden, verpesten

to turn out badly; to become unpleasant or unsuccessful

:
Their business partnership started well, but then things began to go sour.
Hun zakelijke partnerschap begon goed, maar toen begon het mis te gaan.
Their relationship began to go sour after a series of arguments.
Hun relatie begon zuur te worden na een reeks ruzies.