on the muscle

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English

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Prepositional phrase

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on the muscle

  1. (horse-racing) Of a horse: frisky and energetic, seeming keen to race.
    • 1973, Chronicle of the Horse, volume 36, numbers 1-13, page 5:
      Tallhato was "on the muscle" going down the backside, attempting to run out. That's not the formula to beat a filly like Windy's Daughter.
    • 1990, Harness Horse, volume 56, numbers 5-8, page 22:
      I really wasn't able to rest him too much because he was on the muscle more than usual tonight.