WordNet sense 1 (a legislator appointed by the party to enforce discipline):

party whip

WordNet sense 2 (beat severely with a whip or rod):

flog, lash, lather, slash, strap, trounce, welt, lather

WordNet sense 3 (whip with or as if with a wire whisk):

whisk

WordNet sense 4 (defeat thoroughly):

pip, worst, rack up, mop up

WordNet sense 5 (subject to harsh criticism):

blister, scald

WordNet sense 6 (a quick blow delivered with a whip or whiplike object):

whiplash