Sobriquet

‖So′bri′quet″ (sō̍′brē̍′kā̍″), n.[F. sobriquet, OF. soubzbriquet, soubriquet, a chuck under the chin, hence, an affront, a nickname; of uncertain origin; cf. It. sottobecco a chuck under the chin.] An assumed name; a fanciful epithet or appellation; a nickname. [Sometimes less correctly written soubriquet.]