Definition of “mouth” - English Dictionary

“mouth” in British English

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mouthnoun

uk /maʊθ/ us /maʊθ/

mouth noun (BODY PART)

A1 [ C ] the opening in the face of a person or animal, consisting of the lips and the space between them, or the space behind containing the teeth and the tongue:

Open your mouth wide and say "Ah".
You shouldn't put so much food in your mouth at once.

More examples

mouth noun (OPENING)

C1 [ C usually singular ] the opening of a narrow container, the opening of a hole or cave, or the place where a river flows into the sea:

Quebec is at the mouth of the St Lawrence River.

mouthverb [ T ]

uk /maʊð/ us /maʊð/

to form words with the lips without making any sound:

It looks to me as if the singers are only mouthing the words .
[ + speech ] "Can we go?" mouthed Mary.

to say something in a way that is not sincere:

I don't want to stand here listening to you mouthing apologies.
See also

(Definition of “mouth” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“mouth” in American English

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mouthnoun

us /mɑʊθ/

mouth noun (BODY PART)

[ C ] the opening in the face used by a person or animal to eat and drink:

I wish you wouldn’t chew with your mouth open.

mouth noun (OPENING)

[ C usually sing ] the opening of a hole or cave:

We looked down into the mouth of the volcano.

[ C usually sing ] The mouth of a river is the place where it flows into the sea.

[ C usually sing ] The opening of a bottle or jar is also called a mouth.

mouthverb [ T ]

us /mɑʊð, mɑʊθ/

mouth verb [ T ] (BODY PART)

to move the lips as if speaking a word:

I mouthed a single word, "Please."

Phrasal verb(s)

(Definition of “mouth” from the Cambridge Academic Content Dictionary © Cambridge University Press)