Definition of mouth verb from the Oxford Advanced American Dictionary

     

    mouth

     verb
    verb
    NAmE//maʊð//
     
    Verb Forms present simple I / you / we / they mouth
     
    he / she / it mouths
     
    past simple mouthed
     
    -ing form mouthing
     
     
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  1. 1mouth something + speech to move your lips as if you were saying something, but without making a sound He mouthed a few obscenities at us and then moved off.
  2. 2mouth something + speech (disapproving) to say something that you do not really feel, believe, or understand They're just mouthing empty slogans.
  3. Phrasal Verbsmouth off (at somebody/about something)
See the Oxford Advanced Learner's Dictionary entry: mouth