Origin: 1755–65; < Irish tuigim I understand, with English w reflecting the offglide before i of the velarized Irish t typical of southern Ireland; compare dig2
O.E. twigge, from P.Gmc. *twigan (cf. M.Du. twijch, Du. twijg, O.H.G. zwig, Ger. Zweig "branch, twig"), from the root of twi- (see twin), here meaning "forked" (as in O.E. twisel "fork, point of division"). Twiggy "slender" is recorded from 1562.