MULE

(CARRIER) [noun] [C] - an animal whose mother is a horse and whose father is a donkey which is used for transporting loads, or (figurative) a person who agrees to carry illegal drugs into another country in return for payment by the person selling the drugsHe strapped the heavy sacks onto the mule.In those days all the goods were transported across the mountains by mule train (= a group of mules).It's no use arguing with her, she's as stubborn as a mule (= very stubborn).(figurative) These very poor women who are used as mules by drug barons often get long prison sentences.