he sterile offspring of a female horse and a male donkey, valued as a work animal, having strong muscles, a body shaped like a horse, and donkeylike long ears, small feet, and sure-footedness.
Compare hinny.
2.
any hybrid between the donkey and the horse.
3.
Informal. a very stubborn person.
4.
Botany. any sterile hybrid.
5.
Slang. a person paid to carry or transport contraband, especially drugs, for a smuggler.
6.
a small locomotive used for pulling rail cars, as in a coal yard or on an industrial site, or for towing, as of ships through canal locks.
7.
Also called spinning mule. a machine for spinning cotton or other fibers into yarn and winding the yarn on spindles.