Dictionary
Words, grammatical forms and meanings linked to the ontology.
on the muscle en · ADP
Meanings
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Of a horse: frisky and energetic, seeming keen to race.
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.
1973, Chronicle of the Horse, volume 36, numbers 1-13, page 5:I really wasn't able to rest him too much because he was on the muscle more than usual tonight.
1990, Harness Horse, volume 56, numbers 5-8, page 22: