pay up

Meanings

verbpay up (third-person singular simple present pays up, present participle paying up, simple past and past participle paid up)

present singular third person pays up · participle present paying up · participle past paid up · past paid up

ambitransitiveTo pay in total a sum which is owed, especially when the sum has been owed for a period of time.
We could pay up the mortgage on the house, and have something left over.
1875, Horatio Alger, chapter 2, in Herbert Carter's Legacy
5 more examples
At Whitsunday and Martinmas I will have enough to pay up the incumbrance of £3000 due to old Moss's daughter.
1825 December 14 (date written), Walter Scott, “[Entry dated 14 December 1825]”, in David Douglas, editor, The Journal of Sir Walter Scott […], volume I, Edinburgh: David Douglas, published 1890, →OCLC
"Suppose we sell off all the horses, and sell one of your farms, and pay up square?"
1851 June – 1852 April, Harriet Beecher Stowe, chapter 21, in Uncle Tom’s Cabin; or, Life among the Lowly, volume (please specify |volume=I or II), Boston, Mass.: John P[unchard] Jewett & Company; Cleveland, Oh.: Jewett, Proctor & Worthington, published 20 March 1852, →OCLC
The Citizen gained eighteen subscribers; four old ones paid up their accounts.
1910, Louis Joseph Vance, chapter 16, in The Fortune Hunter
[T]he decision pushes Simpson's potential financial obligation to a whopping $33.5 million[…]and left Simpson lawyers swearing that there was no way their client could ever pay up.
1997, Taran Provost, “$25 Million”, in Time
According to this saga of intellectual-property misanthropy, these creatures [patent trolls] roam the business world, buying up patents and then using them to demand extravagant payouts from companies they accuse of infringing them. Often, their victims pay up rather than face the costs of a legal battle.
2013 June 8, “Obama goes troll-hunting”, in The Economist, volume 407, number 8839, page 55
Synonyms: pay off, discharge