Definition of "pay up" []

• To pay for something in total, after a certain amount of time after receiving a purchase. (verb)

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• "I therefore confidently place in Y. H.'s hands my respectful petition, viz., “to pay up the arrears of my salary in Einloesung Schein, and to instruct your cashier to transmit me the amount in future, in the same currency.”"
• "Fadl said that members of al-Qaeda based in Khartoum were prepared to pay up to $1.5 million for a consignment of uranium and that he once saw a cylinder purporting to contain uranium that al-Qaeda members were contemplating buying."
• "Upon a resolution directing the President of the Bank of the State of South Carolina to pay up the arrears of interest on railroad bonds upon which is endorsed the guarantee of the State;"