to lip-sync

Английский Язык - Английский Язык

Определение to lip-sync в Английский Язык Английский Язык словарь

To move lips in synchronization with sounds (generally recorded) so it appears they are the source of the sounds

There was a great scandal when it was discovered the singer had been only lip-syncing.

move the lips in synchronization (with recorded speech or song)