Of a bird or other animal: fully fledged or developed; esp. having reached a fit condition for being killed and used as food. Also: sexually mature.

Of an animal or (occasionally) a person: full-grown; grown up. Now chiefly in Hunting, of animals (esp. buck or male deer) above a particular age.

fit to fly.

Having a good mouth (in various senses); esp. (of a horse) having a mouth which takes the bit well.

New Zealand and North American. Of an animal or its meat: having the characteristics or appearance of a mature male (see quots.).