presume

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He was blind to the intellectual and scholarly virtues that lay beyond the sphere of his authority as York Herald, and the inference that his prerogative had been challenged by Britannia led him to try to intimidate its author by presuming upon the authority of his office.
I am become fond of chemistry, and the taste I have for it has frequently led me into Boerhaave's and the Professor of Chemistry's [Gronovius's] company, who have frequently showed me their collections of rarities, which I find very deficient in metals and minerals; and this defect, presuming upon your granting the favor I am now going to desire, I have promised to supply.
After defying Louis and presuming upon Frederick's friendship, he invents his own fantasy kingdom at Ferney.