Meaning: used to refer to something that’s one’s responsibility
The onus is on Deepthy to prove that she has suffered a loss.
The burden of proving something to be true is what is meant by the word ‘onus’.
The word was borrowed from Latin in the 17th century.
Often, the word ‘onus’ is used as a synonym for the word ‘responsibility’, though it is not exactly a synonym.
Merriam Webster website has some more information about the word.
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