He mouthed the words of the song without actually singing.
mouth the words
idiomTo speak insincerely.
She mouthed the words of an apology to her boss, but everyone knew she did not mean it.
The politician mouthed the words of reform during his speech, yet his voting record suggested he had no intention of changing the current system.
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all mouth and no trousers
Alternative form of all mouth and trousers.
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all mouth and trousers
Superficial, engaging in empty, boastful talk, but not of real substance.
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all one's taste is in one's mouth
One lacks good taste in aesthetic or cultural matters.
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bad taste in one's mouth
A feeling that something is morally despicable as to cause nausea.
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big mouth
The mouth of someone who talks too much, especially by making exaggerated claims or by inappropriately revealing information.
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born with a silver spoon in one's mouth
Born rich, or into a wealthy family.
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butter wouldn't melt in someone's mouth
The identified person appears to be benign, mild-mannered, or calm (but with an integral suggestion that, to the contrary, they really are untrustworthy, disagreeable, or mean-spirited).
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down in the mouth
Sad or discouraged, especially as indicated by one's facial appearance.