Go through the motions in a music video?

• Fake it on stage, say
• Heard aboard loose ships making slogan for mime
• Sing along silently
• Mouth, in a way
• Fake it, in a way
• Sing silently, in a way
• Mouth some music
• Drag show performance

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