高谈阔论: talk with eloquence; talk incessantly [volubly]; talk in a high-sounding phrases [way]; talk in a lofty strain; indulge in high-sounding tirades; indulge in loud and empty talk
喋喋不休: chatter without stop; chatter [rattle] away; a ceaseless chattering -- muttering and grumbling; an endless stream of words; chatter like a magpie; gabble on and on; go [run; talk] nineteen