Meaning of “break-up” - Learner’s Dictionary

break-up

noun [ C ] uk us /ˈbreɪkʌp/
END

the end of a close relationship:

He moved away after the break-up of his marriage.
SEPARATION

the separation of a country, group, etc into several smaller parts

(Definition of “break-up noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)