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English definition of “mouth”

mouth

noun [C usually sing] (OPENING)   /mɑʊθ/
the opening of a hole or cave : We looked down into the mouth of the volcano . The mouth of a river is the place where it flows into the sea . The opening of a bottle or jar is also called a mouth.
(Definition of mouth noun (OPENING) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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