What does mouthing mean?
Mouthing means making the movements needed to speak while producing little or no sound. It can describe a person silently forming words, as when someone lip-syncs without an audible voice, or someone whose lips move conspicuously during conversation. The expression is also associated with “mouthing off,” an informal idiom meaning to speak angrily or impudently to another person, often without authority. In this use, mouthing carries a negative connotation and suggests confrontation, complaint, or disrespect. Although the word may simply describe silent articulation in neutral contexts, its familiar idiomatic use is generally more disparaging. The verb is common in both British and American English, with “mouthing off” especially associated with informal speech. It is useful because it distinguishes visible speech without sound from ordinary speaking and also captures the familiar idea of someone talking back or protesting verbally.
verbTo form words with the lips without producing audible speech, or to move the lips conspicuously as if speaking. In the informal phrase “mouthing off,” it means speaking angrily or impudently to someone, especially without permission.
- To move the lips as though speaking, especially without producing a sound.
- To utter words in an exaggerated, indistinct, or otherwise conspicuous way.
- To speak angrily or impudently without authorization, as in “mouthing off.”
"She was mouthing the words of the song while the sound was turned off."
"Instead of answering, he began mouthing off at his teammate."
"The actors continued mouthing the words while the soundtrack played."
Mouthing allows a person to have a complete conversation with the sound turned down.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does mouthing come from?
“Mouthing” is a derivative of “mouth,” formed in English from the existing verb meaning to form words with the lips. “Mouth” comes from Old English mūþ, which developed from Proto-Germanic *mūþuz and ultimately from an Indo-European root associated with speaking or the mouth. The modern form preserves the older consonant while shortening the vowel in the derivative “mouthing.” Related forms such as “mouthful,” “mouthpiece,” and “mouthy” continue the same English word family.
How mouthing is actually used
The phrase “mouthing off” is informal and usually critical, suggesting that someone is speaking rudely, loudly, or without permission. Used alone, “mouthing” often implies either silent speech or exaggerated lip movements.