Nouns

(n)split, stock split, split upan 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”

Verbs

(v)divorce, split upget a divorce; formally terminate a marriage“The couple divorced after only 6 months”
(v)divide, split, split up, separate, dissever, carve upseparate into parts or portions“divide the cake into three equal parts”, “The British carved up the Ottoman Empire after World War I”
(v)separate, part, split up, split, break, break updiscontinue 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”
(v)break, separate, split up, fall apart, come apartbecome separated into pieces or fragments“The figurine broke”, “The freshly baked loaf fell apart”