mouth off

M m

Definitions of mouth off words

noun plural mouth off Anatomy, Zoology. the opening through which an animal or human takes in food. the cavity containing the structures used in mastication. the structures enclosing or being within this cavity, considered as a whole. 1
noun plural mouth off the masticating and tasting apparatus. 1
noun plural mouth off a person or animal dependent on someone for sustenance: another mouth to feed. 1
noun plural mouth off the oral opening or cavity considered as the source of vocal utterance. 1
noun plural mouth off utterance or expression: to give mouth to one's thoughts. 1
noun plural mouth off talk, especially loud, empty, or boastful talk: That man is all mouth. 1

before 900

One of the 4% oldest English words

before 900; Middle English; Old English mūth; cognate with German Mund, Old Norse munnr

noun

adjective

verb

adverb

pronoun

preposition

conjunction

determiner

exclamation

A common word. It’s meaning is known to most children of preschool age. About 99% of English native speakers know the meaning and use the word.

Most Europeans know this English word. The frequency of it’s usage is somewhere between "mom" and "screwdriver".

This diagram is provided by Google Ngram Viewer

sass — impudent or disrespectful back talk: Both parents refuse to take any sass from their kids.
answer back — If someone, especially a child, answers back, they speak rudely to you when you speak to them.
talk back — the act of talking; speech; conversation, especially of a familiar or informal kind.