Lip-___ (pretend to sing) (4)

I believe the answer is:

sync

(Other definitions for sync that I've seen before include "In which things occur simultaneously" , "go together" , "Togetherness (of sound and picture, say)" , "In which one's matching" , "Unison (abbrev.)" .)

I've seen this clue in the Universal, the Family Time, The Washington Post and the USA Today.

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