Drag show performance

• Not really sing
• Align mouth move­ments with recorded speech
• Go through the motions in a music video?
• Fake it, musically
• Linking of speaker's mouth movements and voice in filmed recordings
• Audio and video alignment of speech
• Mouth the lyrics
• Mouth some music
• Fake it, in a way

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