Mouth the lyrics

• Audio and video alignment of speech
• Go through the motions in a music video?
• Linking of speaker's mouth movements and voice in filmed recordings
• Pretend to sing, perhaps
• Fake it on stage, say
• Not really sing
• Heard aboard loose ships making slogan for mime
• Mouth, in a way
• Align mouth move­ments with recorded speech

Wiktionary Word definitions in Wiktionary
n. (alternative spelling of lip sync English) vb. (alternative spelling of lip-sync English)