#1 split up n. 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". wn
#2 split up v. get a divorce; formally terminate a marriage; "The couple divorced after only 6 months". wn
#3 split up v. separate into parts or portions; "divide the cake into three equal parts"; "The British carved up the Ottoman Empire after World War I". wn
#4 split up v. 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". wn
#5 split up v. become separated into pieces or fragments; "The figurine broke"; "The freshly baked loaf fell apart". wn
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