Retail
late Middle English: from an Anglo-Norman French use of Old French retaille ‘a piece cut off’, from retaillier, from re- (expressing intensive force) + tailler ‘to cut’.
wiktionary
From the Old French verb retaillier.
etymonline
retail (v.)
early 15c., retailen, "sell in small quantities or parcels," from the noun or from Old French retaillier "cut back, cut off, pare, clip, reduce, circumcise," from re- "back" (see re-) + taillier "to cut, trim" (see tailor (n.)). Sometimes also "to deal out (information, etc.) in small quantities; hand down by report; recount, tell over again" (1590s). Related: Retailed; retailing.
retail (n.)
early 15c., "sale of commodities in small quantities or parcels" (opposed to wholesale), from Old French retail "piece cut off, shred, scrap, paring" (Modern French retaille), from retaillier "cut back, cut off" (see retail (v.)). The notion of the English word is "a selling by the piece." This sense is not in French, however, and comes perhaps from cognate Italian ritaglio, which does have that sense. As an adjective, "of or pertaining to sale at retail," c. 1600.
