Meaning of “read sb's lips” in the English Dictionary

british dictionary

"read sb's lips" in British English

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read sb's lips

to follow the movements of someone's lips in order to understand what is being said, especially if you are unable to hear them speak:

She read his lips across the busy conference hall - "Time to go."
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(Definition of “read sb's lips” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)