Definition of "split up"

split up

verb
third-person singular simple present splits up, present participle splitting up, simple past and past participle split up
1. (intransitive, idiomatic, Of a group of people) Cease to be together, break apart from the group.
2. (transitive) separate, disassociate, cause to come apart.
adjective
not comparable
1. Divided or separated.
2. (slang, obsolete) Of a person: having long legs.
  Quotations
  He should preferably be tall, weighty, well split up in the legs (especially from the hip-joint to the knee), neatly turned at the knee and ankle joints […]
  1913, S. A. Mussabini, Charles Ranson, The Complete Athletic Trainer, page 17