an animal used for carrying heavy loads or pulling heavy equipment, as a donkey, mule, or ox.
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British Dictionary definitions for beast of burden
an animal, such as a donkey or ox, used for carrying loads
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012