Move mouth to fit a soundtrack

• Sing silently, in a way
• Fake it on stage, say
• Go through the motions in a music video?
• Mouth some music
• Mouth the lyrics
• Milli Vanilli deception
• Mouth the words to a recorded song: Hyph
• Emulate Milli Vanilli
• Heard aboard loose ships making slogan for mime

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