mouth

mouth off

verb

Definition of MOUTH

to talk as if giving an important and formal speech <some crank mouthing off in the center of town to anyone who would listen>

Synonyms declaim, discourse, harangue, mouth (off), perorate

Related Words rant, rave; bloviate, blow; lecture, preach, sermonize; advertise, announce, broadcast, declare, proclaim, pronounce; speak, speechify, talk