lip-synch - definition and synonyms

verb [intransitive] 

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/ˈlɪp ˌsɪŋk/
present tense
I/you/we/theylip-synch
he/she/itlip-syncs
present participlelip-syncing
past tenselip-synced
past participlelip-synced

or lip-sync 

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  1. to pretend to sing or say something by moving your lips at the same time as a recording of music or speech is played