mouth off

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

말대꾸하다, 건방지게 말하다

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

:
He got fired for mouthing off to his boss.
그는 상사에게 말대꾸하다가 해고당했다.
Don't mouth off to your elders.
어른들한테 말대꾸하지 마.