Brocket

Near-synonyms: knobber, knobbler, pricket, spitter

“Why, a stag is called a brocket until he is three years old, at four years he is a staggart; at five years a warrantable stag; and after five years he becomes a hart royal.”

Before fighting, brockets rear and jump in display; when fighting, they jump over each other, striking the opponent with the hooves of the forelegs or hind legs in passing.