lip-synch

verb

ˈlip-ˌsiŋk 

variants or lip-sync

lip-synched or lip-synced; lip-synching or lip-syncing; lip-synchs or lip-syncs

transitive verb

: to pretend to sing or say at precisely the same time with recorded sound

She lip-synched the song that was playing on the radio.

intransitive verb

: to lip-synch something

It was obvious that she was lip-synching.

lip sync noun

lip-syncher noun

or lip-syncer

Word History

First Known Use

circa 1961, in the meaning defined at transitive sense