This page is about the phrasal verb mouth offINFORMAL
to speak in a loud and annoying way, especially when criticizing or complaining about something
- mouth off Some guy in the pub got punched because he was mouthing off about something and I guess he upset someone.
- mouth off After he'd had a couple of beers Robert started mouthing off about the evils of big government again last night.
Contributor: Matt Errey