break up is a verb meaning "to cause to separate and go in different directions". It carries 19 recorded senses.
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”
break violently or noisily; smash
cause to go into a solution
“The recipe says that we should dissolve a cup of sugar in two cups of water”
take apart into its constituent pieces
cause to separate
“break up kidney stones”
“disperse particles”
separate (substances) into constituent elements or parts
chemistry
Definitions, synonyms and semantic relations for break up come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.