Lip sync and Sync up

Lip sync noun - 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.

Sync up and lip sync are semantically related. In some cases you can use "Sync up" instead a verb phrase "Lip sync".

Lip sync and sync up are semantically related. Sometimes you can use "Lip sync" instead a verb "Sync up".