- 1an animal that has a horse and a donkey as parents, used especially for carrying loads He's as stubborn as a mule.
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- 2(slang) a person who is paid to take drugs illegally from one country to another The authorities believe these men are important figures in the drug trade, not merely mules.
- 3a slipper (= a soft shoe for wearing indoors) that is open around the heel
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