verb (used with or without object)
to talk or utter rapidly, indistinctly, incoherently, or nonsensically; chatter.
rapid, indistinct, or nonsensical talk; gibberish.
braggart, boaster, blowhard, know-it-all, bragger, gasbag, chatterbox, gossipmonger, windbag, squealer, gossiper, tattletale, blabber, loudmouth, chatterer, babbler, gascon, motor-mouth, bigmouth, gabber
Origin of jabber
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
to speak or say rapidly, incoherently, and without making sense; chatter
Word Origin for jabber
C15: of imitative origin; compare gibber 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
1650s, spelling variant of Middle English jablen (c.1400), also javeren, jaberen, probably ultimately echoic. Related: Jabbered; jabbering. The noun is 1727, from the verb.
Online Etymology Dictionary, © 2010 Douglas Harper