Wiktionary
lip-sync
vb. (context music English) To move lips in synchronization with sounds (generally recorded) so it appears they are the source of the sounds.
WordNet
lip-sync
v. move the lips in synchronization (with recorded speech or song) [syn: lip-synch]
Usage examples of "lip-sync".
Several hoods in front of him, sleek little fuel-injected Alpha particle manned by sandalwood-haired guy hugging cellular phone swaps places with convertible Stuttgart-apparatus piloted by blond bombshell lip-syncing to the same song Kraft himself has tuned in on the radio.
But now he had a visual representation on the laptop screen, an avatar, a handsome yet slightly cartoonish face that lip-synced with the words coming from the speakers.