A domestic animal, Equus asinus asinus, similar to a horse. / A stubborn person. / A fool. / (nautical) A small auxiliary engine. / (naval slang, dated) A box or chest, especially a toolbox.

plural of donkey

(UK) A long time.

A fake bid at an auction, used by the auctioneer to raise the price and thus raise the commission.

A rarity;

A water-heating system for domestic use, consisting of a drum of water mounted above a fire.

(Britain, Ireland, Australia, idiomatic) A long time, years and years.

(Britain) A type of thick jacket, usually dark blue, often worn by men who work outside (though originally worn by donkeymen)

(informal) A pumpjack.

(idiomatic) Hard, boring, routine work.