break off
US /breɪk ɔf/
UK /breɪk ɔf/

1.
2.
to suddenly stop speaking or doing something
:
•
She broke off in mid-sentence.
•
The negotiations broke off without an agreement.
3.
to end a relationship or agreement suddenly
:
•
They decided to break off their engagement.
•
The two countries broke off diplomatic relations.