go back on
US /ɡoʊ bæk ɑːn/
UK /ɡoʊ bæk ɑːn/

1.
sözünden dönmek, caymak
fail to keep a promise or agreement
:
•
He promised to help me, but he went back on his word.
Bana yardım edeceğine söz verdi ama sözünden döndü.
•
You can't just go back on our agreement now.
Şimdi anlaşmamızdan dönemezsin.