1.
to separate into smaller pieces :
The ship broke up on the rocks.
2.
to come to an end :
Their marriage has broken up.
—related noun break-up
3.
to go away in different directions :
The meeting broke up at eleven o'clock.
4.
( especially BrE ) to begin the holidays when school closes at the end of a term :
When do you break up for Christmas?
5.
( BrE ) to become very weak :
He was breaking up under the strain.
6.
( NAmE ) to laugh very hard :
Woody Allen makes me just break up.
7.
when a person who is talking on a mobile phone / cellphone breaks up , you can no longer hear them clearly because the signal has been interrupted