WordNet sense 1 (discontinue an association or relation; go different ways):

break, part, separate, split, separate, split up

WordNet sense 2 (to cause to separate and go in different directions):

dispel, disperse, dissipate, scatter

WordNet sense 3 (suffer a nervous breakdown):

collapse, crack, crack up, crock up

WordNet sense 4 (take apart into its constituent pieces):

disassemble, dismantle, break apart, take apart

WordNet sense 5 (break violently or noisily; smash):

crash

WordNet sense 6 (set or keep apart):

sever

WordNet sense 7 (attack with or as if with a pickaxe of ice or rocky ground, for example):

pick

WordNet sense 8 (release ice):

calve

WordNet sense 9 (make a break in):

disrupt, interrupt, cut off

WordNet sense 10 (cause to go into a solution):

dissolve, resolve, resolve

WordNet sense 11 (close at the end of a session):

adjourn, recess, recess

WordNet sense 12 (separate (substances) into constituent elements or parts):

decompose, break down

WordNet sense 13 (break or cause to break into pieces):

fragment, fragmentize, fragmentise