Longman Dictionary of Contemporary English homepage

mouth

2 verb
     
mouth2 [transitive]
1 to move your lips in the same way you do when you are saying words, but without making any sound:
She silently mouthed the words 'Good luck'.
Philip mouthed something through the glass which she did not hear.
2 to say things that you do not really believe or that you do not understand:
The players mouthed clichés about what they hoped to do at the World Cup.
They mouthed the usual platitudes.

mouth off

phrasal verb
to complain angrily and noisily about something, or talk as if you know more than anyone else
mouth off at/to
You should have heard Pete mouthing off at Joe.
mouth off about
Morris was mouthing off about his former team.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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