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Related to split up: split off
1. To separate or divide into two or more pieces, groups, sets, etc. We'll find them faster if we all split up. The polar ice caps are going to start splitting up if global temperatures continue to rise.
2. To cause something or a group to separate or divide into two or more smaller pieces, groups, sets, etc. A noun or pronoun can be used between "split" and "up." Take this axe and go split those logs up into firewood. The teacher split up the class to work on the project in groups.
3. To end a romantic relationship with someone else. My parents split up when I was only five years old. Mary says that she split up with Sarah, but they've had such an off-again-on-again relationship that none of us is surprised anymore.
4. To cause a romantic couple to end their relationship. A noun or pronoun can be used between "split" and "up." My mom's gambling issues very nearly split up her marriage, but she got counseling and they're still together to this day. Tommy's been conniving to split Jenny and Phil up because he's still madly in love with her.
split people up
to separate two or more people (from one another). If you two don't stop chattering, I'll have to split you up. I will have to split up that twosome in the corner.
split someone or something up (into something)
to divide people or things up into something, such as groups. I had to split the group up into two sections—there were so many who showed up. I split up the class into two discussion sections.
split up (with someone)
[for someone] to separate from someone; to break up a marriage or love affair. Jeff split up with Judy. I had heard that they had split up with each other.
1. To separate someone or something, such as people or groups; disunite someone or something: Artistic differences split up the band. They've been together too long to let a little argument split them up.
2. To become divided or part company as a result of discord or disagreement: My parents split up after 20 years of marriage.
3. To divide something, as for convenience or proper ordering: They split up the remainder of the money among themselves and parted ways. We split the project up into stages.
4. To become divided or be divisible: Let's split up into teams. This poem doesn't split up into stanzas very well.
1. in. to separate. The two split up and went their separate ways.
2. n. an act of separating or breaking up. (Usually split-up.) Everyone was mentally prepared for the company’s split-up.