lash (n.)

c. 1300, las "a blow, a stroke," later "flexible part of a whip" (late 14c.), possibly imitative; compare lash (v.1), which might be the immediate source of this. Century Dictionary says Irish lasg "a lash, whip, whipping" is of English origin. The lash "punishment by flogging" is from 1690s.

lash (v.1)

c. 1300, "to deal a blow;" later "to strike with a whip, beat with a lash" (late 14c.), possibly imitative. To lash out "to strike out violently" (originally of horses) is from 1560s and preserves the older sense. Related: Lashed; lashing.

lash (v.2)

"to tie or bind," as with rope or cord, 1620s, originally nautical, from Middle French lachier, from Old French lacier "to lace on, fasten with laces; entrap, ensnare" (see lace (v.)). Related: Lashed; lashing.

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Definitions of lash from WordNet
lash (v.)
beat severely with a whip or rod;
Synonyms: flog / welt / whip / lather / slash / strap / trounce
lash (v.)
lash or flick about sharply;
The lion lashed its tail
lash (v.)
strike as if by whipping;
Synonyms: whip
lash (v.)
bind with a rope, chain, or cord;
lash the horse
lash (n.)
any of the short curved hairs that grow from the edges of the eyelids;
Synonyms: eyelash / cilium
lash (n.)
leather strip that forms the flexible part of a whip;
Synonyms: thong
lash (n.)
a quick blow delivered with a whip or whiplike object;
Synonyms: whip / whiplash