chin music

(folk music): The name jokingly refers to "playing" the mouth as if it were an instrument.

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chin music (uncountable)

1. (baseball, informal) A fastball thrown near the batter's chin, often to set up a subsequent pitch thrown low and outside.

   Jones backed Smith off the plate with a little chin music.

2. (cricket, informal) A bouncer aimed near the batsman's chin.
3. (US, slang, dated) Idle talk; chatter.
4. (folk music, informal) Rhythmic singing, usually to nonsense syllables, in a style partly inspired by the instruments used to accompany folk dancing in Irish and Scottish traditions.