verb

talk at length, typically about trivial matters.

Franny walked past a woman gabbing on the phone

chatter,chitter-chatter,chat,talk,gossip,gabble,babble,prattle,jabber,blather,blab,yak,yackety-yak,yabber,yatter,yammer,blabber,blah,blah-blah,jaw,gas,shoot one’s mouth off,witter,rabbit,chunter,natter,waffle,run off at the mouth,mag,twaddle,clack,twattle