pony up
verb
Forms ponies up ponying up ponied up
Synonyms
cough up pay up ante up defray do the needful expend foot the bill fork out fork over imburse lay out pay pay the freight pay the piper pay the price quit shell out spend stump up spit up
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”), a line from Psalm 119, verses of which are traditionally used in prayer in Anglican churches on the 25th of the month, becoming associated particularly with March 25th, a traditional day of debt settlement. This etymology has been accepted by the American Heritage Dictionary.
Sources: Wiktionary · WordNet 3.0 — from the Wiktionary entry “pony up”, CC BY-SA 4.0. Details