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onus (n.)

"a burden," 1640s, from Latin onus "load, burden," figuratively "tax, expense; trouble, difficulty," from PIE *en-es- "burden" (source of Sanskrit anah "cart, wagon"). Hence legal Latin onus probandi (1722) "the task of proving what has been alleged," literally "burden of proving."

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Definitions of onus

onus (n.)
an onerous or difficult concern;
From wordnet.princeton.edu