1. Separate into parts or portions
   "split up the cake into three equal parts";
   - divide, split, separate, dissever [rare], carve up
    
2. Discontinue an association or relation; go different ways
   "My friend and I split up";
   - separate, part, split, break, break up
    
3. Get a divorce; formally terminate a marriage
   "The couple split up after only 6 months";
   - divorce
    
4. Become separated into pieces or fragments
   "The figurine split up";
   - break, separate, fall apart, come apart

Derived forms: split up, splits up, splitting up

See also: fall

Type of: break, break off, cease, change integrity, discontinue, give up, lay off, quit, stop, surcease [archaic]

Antonym: unify