burden : Idioms & Phrases
Beast of burden
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noun an animal such as a donkey or ox or elephant used for transporting loads or doing other heavy work
jument.
WordNet
- an animal employed in carrying burdens.
Webster 1913
Burden of proof
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noun the duty of proving a disputed charge
WordNet
L. onus probandi (Law) , the duty of proving a particular position in a court of law, a failure in the performance of which duty calls for judgment against the party on whom the duty is imposed.
Webster 1913
white man's burden
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noun the supposed responsibility of the white race to provide care for their non-white subjects