WordNet
lip synch
n. combining audio and video recording in such a way that the sound is perfectly synchronized with the action that produced it; especially synchronizing the movements of a speaker's lips with the sound of his speech [syn: lip synchronization, lip synchronisation, lip sync]
Wikipedia
Lip Synch (series)
Lip Synch is a series of 5 short films which used vox pops as inspiration for their subject matter. They were commissioned by Channel 4 in 1989. Nick Park's contribution to the series was the film Creature Comforts, which later won the Academy Award for Best Animated Short of 1990. Channel 4 screened the films as part of their Four-Mations UK season in November 1990.
Peter Lord said:
Usage examples of "lip synch".
He's speaking English--translation programs don't bother to lip synch.