split up

US /splɪt ˈʌp/
UK /splɪt ˈʌp/
"split up" picture
1.

to end a relationship or marriage

:
They decided to split up after ten years together.
I was sad when my favorite band split up.
2.

to divide into smaller groups or parts

:
The teacher asked the students to split up into pairs for the activity.
The large crowd began to split up into smaller groups as they left the stadium.