American English

Definition of lip-sync verb from the Oxford Advanced American Dictionary

 

lip-sync

 verb
(also lip-synch) verb
NAmE//ˈlɪp sɪŋk//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they lip-sync
 
he / she / it lip-syncs
 
past simple lip-synced
 
-ing form lip-syncing
 
 
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to move your mouth, without speaking or singing, so that its movements match the sound on a recorded song, etc. lip-sync (to something) She lip-synced to a Beatles song. lip-sync something He lip-synced “Return to Sender.”
See the Oxford Advanced Learner's Dictionary entry: lip-sync