Meaning of the word mouthing in English

What does mouthing mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

mouthing

US /ˈmaʊðɪŋ/
UK /ˈmaʊðɪŋ/

Noun

the action of forming words with the lips without making any sound

Example:
She was mouthing silent instructions to her friend across the room.
His constant mouthing off got him into trouble with the teacher.