wild horse; untamed horse
Refers to a horse that is not domesticated or is difficult to control. Can be used literally or figuratively for a spirited, unruly person.
He is a young man like a wild horse.
It is difficult to tame a wild horse.
Compound of 荒 (rough, wild) and 駒 (horse, foal). The exact historical derivation is uncertain, but the combination directly conveys the meaning of a wild or untamed horse.