gab (n.)youdaoicibaDictYouDict[gab 词源字典]
"action of talking," earlier "chatter, loquacity, idle talk" (mid-13c.), also "falsehood, deceit," originally "a gibe, a taunt" (c. 1200), mid-13c., probably from a Scandinavian source akin to Old Norse gabb "mocking, mockery," and in part from Old French gap, gab "joke, jest; bragging talk," which also is probably from Scandinavian (compare gab (v.)). Probably also there is influence from Scottish and northern English gab "the mouth" (see gob); OED reports the word "Not in dignified use." Gift of (the) gab "talent for speaking" is from 1680s.[gab etymology, gab origin, 英语词源]