Meaning

• A small horse; specifically, any of several small breeds of horse under 14.2 hands at the withers.

• A small serving of an alcoholic beverage, especially beer.

  "1879, “Some Queer Interviews: Interview with a Pony of Beer”, Puck, Vol. 5–6, p. 435"

• (New South Wales, Victoria) A serving of 140 millilitres of beer (formerly 5 fl oz); a quarter pint.

• Twenty-five pounds sterling.

• A translation used as a study aid; loosely, a crib, a cheat-sheet.

• A ponytail hairstyle.

Meaning

• To lead (a horse) from another horse.

• To use a crib or cheat-sheet in translating.