Etymology
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Words related to lick

*leigh- 
Proto-Indo-European root meaning "to lick." It forms all or part of: cunnilingus; lecher; lichen; lick.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit ledhi "he licks," Armenian lizum "I lick," Greek leikhein "to lick," Latin lingere "to lick," Old Irish ligim "I lick," Welsh llwy "spoon," Old English liccian "to lick."
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cowlick (n.)

also cow-lick, "tuft of hair out of position and natural direction," 1590s, from cow (n.) + lick (n.). Because it looks like a cow licked your head.

salt-lick (n.)

"place resorted to by animals to satisfy the natural craving for salt," 1751; see salt (n.) + lick (n.).

licking (n.)
"an act of licking or lapping," late 14c., verbal noun from lick (v.1); meaning "a beating" (1756) is from lick (v.2).
boot-licker (n.)
also bootlicker, "toady, servile follower," 1846, from boot (n.1) + agent noun from lick (v.). Foot-licker in the same sense is from 1610s.
lickety-split (adj.)
1852, American English; earlier lickety-cut, lickety-click, and simply licketie (1817), probably a fanciful extension of lick (n.1) in its dialectal sense of "very fast sprint in a race" (1809) on the notion of a flick of the tongue as a fast thing (compare blink, snap).
lickspittle (n.)
also lick-spittle, "sycophant, abject toady, one who will do any repulsive thing," 1741, from lick (v.1) + spittle. Phrase lick the spittle as a repulsive act is from 1640s.