split up phrasal verb ( see also ↑ split )
1 . if people split up, or if someone splits them up, they end a marriage or relationship with each other:
Steve’s parents split up when he was four.
split up with
I thought she’d split up with her boyfriend.
split somebody ↔ up
Why would she try to split us up?
2 . to divide people into different groups, or to be divided into groups:
Please don’t split up when we get to the museum.
split something/somebody ↔ up
The teacher split up the class into three groups.
3 . split something ↔ up to divide something into different parts
split something ↔ up into
The house has now been split up into individual flats.