buck

A male deer, antelope, sheep, goat, rabbit, hare, and sometimes the male of other animals such as the hamster, ferret, salmonid, shad and kangaroo.

An uncastrated sheep, a ram.

An antelope of either sex; compare with Afrikaans bok.

There are all kinds of game in the valley, and you are unlucky if you do not see a giraffe or an ostrich, or at least a herd of buck.

The sound made by a chicken.

A young buck; an adventurous, impetuous, dashing, or high-spirited young man.

Swankey of the Body Guard himself, that dangerous youth, and the greatest buck of all the Indian army now on leave, was one day discovered by Major Dobbin tête-à-tête with Amelia, and describing the sport of pig-sticking to her with great humour and eloquence […]

To copulate, as bucks and does.

To bend; buckle.

To leap upward arching its back, coming down with head low and forelegs stiff, forcefully kicking its hind legs upward, often in an attempt to dislodge or throw a rider or pack.

1849, Jackey Jackey, The Statement of the Aboriginal Native Jackey Jackey, who Accompanied Mr. Kennedy, William Carron, Narrative of an Expedition Undertaken Under the Direction of the Late Mr. Assistant Surveyor E. B. Kennedy, 2004 Gutenberg Australia eBook #0201121, At the same time we got speared, the horses got speared too, and jumped and bucked all about, and got into the swamp.

To throw (a rider or pack) by bucking.

The brute that he was riding had nearly bucked him out of the saddle.

To resist obstinately; oppose or object strongly.

The vice president bucked at the board’s latest solution.

To move or operate in a sharp, jerking, or uneven manner.

The motor bucked and sputtered before dying completely.