WordNet sense 1 (any of the short curved hairs that grow from the edges of the eyelids):

cilium, eyelash

WordNet sense 2 (leather strip that forms the flexible part of a whip):

thong

WordNet sense 3 (beat severely with a whip or rod):

flog, lather, slash, strap, trounce, welt, whip, lather

WordNet sense 4 (a quick blow delivered with a whip or whiplike object):

whiplash