mouth /maʊð/ verb [T] ↑Verb Endings for mouth
► F0 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.» I don't want to stand here listening to you mouthing (= saying in a way that is not sincere) excuses.→ SEE ALSO BAD-MOUTH(Cf. ↑bad-mouth)Thesaurus+: ↑Saying and uttering , ↑Saying again mouth /maʊθ/ noun [C usually singular] (OPENING)
► C1 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.See picture: river mouth 
Thesaurus+: ↑Holes, hollows and dipsThesaurus+: ↑Parts of watercourses
mouth /maʊθ/ noun [C] (BODY PART)
► A1 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.See picture: mouth 
Thesaurus+: ↑The mouth and throat
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Extra Examples:» He put a grape into his mouth and swallowed it whole.» It's not polite to talk with your mouth full.» She gave him a great big kiss on the mouth.» She punched him in the mouth and two of his teeth came out.» She clapped her hand over her mouth to try to stop herself from laughing.