mouth off

US /maʊθ ɔf/
UK /maʊθ ɔf/
"mouth off" picture
1.

frech werden, das Maul aufreißen

to speak in an insolent or disrespectful way, especially to someone in authority

:
He got fired for mouthing off to his boss.
Er wurde gefeuert, weil er seinen Chef angeblafft hat.
Don't mouth off to your elders.
Rede nicht frech zu deinen Älteren.