Definition of "mule"
noun:
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A generally sterile male or female hybrid offspring of a male donkey and a female horse.
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A generally sterile hybrid offspring of any two species of animals.
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A stubborn person.
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A person paid to smuggle drugs.
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A coin or medal minted with obverse and reverse designs not normally seen on the same piece, either intentionally or in error.
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A character on an MMORPG used mainly to store extra inventory of the owner's primary character.
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A shoe that has no fitting or strap around the heel, but which covers the foot.
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