noun, plural -nies, verb, -nied, -ny⋅ing.| 1. | a small horse of any of several breeds, usually not higher at the shoulder than 14 1/2 hands (58 in./146 cm). |
| 2. | a horse of any small type or breed. |
| 3. | Slang. a literal translation or other text, used illicitly as an aid in schoolwork or while taking a test; crib. |
| 4. | something small of its kind. |
| 5. | a small glass for liquor. |
| 6. | the amount of liquor it will hold, usually one ounce (29.6 ml). |
| 7. | a small beverage bottle, often holding seven ounces (196 g): We bought a dozen ponies of Mexican beer. |
| 8. | Older Slang. a diminutive chorus girl. |
| 9. | pony pack. |
| 10. | British Slang. the sum of 25 pounds. |
| 11. | Slang. to prepare (lessons) by means of a pony. |
| 12. | Racing Slang.
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| 13. | to prepare a lesson or lessons with the aid of a pony. |
| 14. | pony up, Informal. to pay (money), as in settling an account: Next week you'll have to pony up the balance of the loan. |
pony up
Pay money that is owed or due, as in Come on, it's time you ponied up this month's rent. The allusion in this expression is unclear. [c. 1820]