pony up

verb

Etymology: Originally often poney. US early 19th century. According to Michael Quinion, probably not from the monetary sense of pony and instead from Latin "Legem pone mihi Domine viam iustificationum tuarum" (“Teach me, O Lord, the way of thy statutes”) in reference to March 25th, a traditional day of debt settlement. This etymology has been accepted by the American Heritage Dictionary.

1. To pay (usually a bill, debt or due).

   “Every man, save Silvy, vociferously swore that he had ponied up his "quarter:" whereupon the landlady observed that Silvy the less had not paid his reckoning.”

   “Know what I'd do with that dough ... if I'd the luck to have it?¶ I'd buy War Bonds—and, God, would I hang onto them! (Bonds buy guns—and give you four bucks for your three) ... I'd pony up for taxes cheerfully (knowing they're the cheapest way to pay for this war) ... I'd sock some in the savings bank, while I could ... I'd lift a load off my mind with more life insurance.”