split up (n.)

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 up (v.)

1.become separated into pieces or fragments"The figurine broke" "The freshly baked loaf fell 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"

3.separate into parts or portions"divide the cake into three equal parts" "The British carved up the Ottoman Empire after World War I"

4.get a divorce; formally terminate a marriage"The couple divorced after only 6 months"