WordNet sense 1 (a vigorous blow):

bang, bash, belt, knock

WordNet sense 2 (a serious collision (especially of motor vehicles)):

smash-up

WordNet sense 3 (reduce to bankruptcy):

bankrupt, break, ruin

WordNet sense 4 (humiliate or depress completely):

crush, demolish

WordNet sense 5 (damage or destroy as if by violence):

bang up, smash up

WordNet sense 6 (hit hard):

blast, boom, nail

WordNet sense 7 (a hard return hitting the tennis ball above your head):

overhead

WordNet sense 8 (with a loud crash):

smashingly

WordNet sense 9 (break into pieces, as by striking or knocking over):

dash

WordNet sense 10 (the act of colliding with something):

crash

WordNet sense 11 (a conspicuous success):

hit, smasher, strike