split up in WordNet English dictionary

1. become separated into pieces or fragments
   "The figurine broke"; "The freshly baked loaf fell apart"
   break  separate  split up  fall apart  come apart 
   
2. discontinue an association or relation; go different ways
   "The business partners broke over a tax question"; "The couple separated after 25 years of marriage"; "My friend and I split up"
   separate  part  split up  split  break  break up 
   
3. separate into parts or portions
   "divide the cake into three equal parts"; "The British carved up the Ottoman Empire after World War I"
   divide  split  split up  separate  dissever  carve up 
   
4. get a divorce; formally terminate a marriage
   "The couple divorced after only 6 months"
   divorce  split up 
   

1. an increase in the number of outstanding shares of a corporation without changing the shareholders' equity
   "they announced a two-for-one split of the common stock"
   split  stock split  split up