Dictionary
lip-sync
Pronunciation: (lip'singk"), [key] Motion Pictures, Television.
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v.t., v.i.
1. to synchronize (recorded sound) with lip movements, as of an actor in a film.
2. to match lip movements with (recorded speech or singing):
She did a clumsy job of lip-syncing her big song.
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n.
1. the technical process by which this is done.
2. the simultaneous recording of voice and picture, esp. the synchronization of lip movements with recorded sound.
Also,lip'synch",lip'sync".Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.