WordNet sense 1 (the swift release of a store of affective force):

bang, boot, charge, flush, thrill, rush

WordNet sense 2 (the backward jerk of a gun when it is fired):

recoil, recoil

WordNet sense 3 (informal terms for objecting):

beef, gripe, squawk

WordNet sense 4 (spring back, as from a forceful thrust):

kick back

WordNet sense 5 (express complaints, discontent, displeasure, or unhappiness):

complain, kvetch, plain, quetch, sound off

WordNet sense 6 (a rhythmic thrusting movement of the legs as in swimming or calisthenics):

kicking