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English definition of “the onus”

the onus

noun [S] uk   /ˈəʊ.nəs/ us    /ˈoʊ-/ formal
the responsibility or duty to do something: [+ to infinitive] The onus is on the landlord to ensure that the property is habitable. We are trying to shift the onus for passenger safety onto the government.
(Definition of the onus from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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