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The verb is from Middle English tasten, borrowed from Old French taster (“to taste, touch or hit”), from unattested Vulgar Latin *tastāre (“to touch or feel”), from *taxitāre, an innovated iterative form of Classical Latin taxāre (“to touch sharply”), from tangere (“to touch, to grasp”), ultimately from Proto-Indo-European *teh₂g-, which is assumed to have had the same meaning as tangere. The noun came from the verb, and the two conflated after English lost its infinitive suffix -en, though tasten was most likely already used nominatively (as a gerund), similar to Modern English tasting. Almost fully displaced native smack, from Middle English smac, smak, smacke, from Old English smæc, smæċċ (“taste, smatch”). Displaced English smatch, from Middle English smacchen, smecchen, from Old English smæċċan (“to taste; to smack”); displaced also Middle English buriȝen, from Old English bierġan (“to taste”).