Synonyms of 'be the duty of or be someone's duty'
▷ See duty
be up to
It is the duty of the state to maintain the educational system.
be up to (informal)
I think it behoves us, sir, to get out of here with all speed.
be (someone's) pigeon (British , informal)
be incumbent upon
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Thesaurus for be the duty of or be someone's duty from the Collins English Thesaurus