pony glass

Meaning

Noun

• A small glass for alcoholic drinks.
• A quarter-pint glass (formerly 5 imperial fl oz, metrized to 140 ml).

Origin

• From the small size; see etymology of pony.Notes and Queries, August 8th, 1896, : “It seems probable the origin is due to the diminutiveness of the glass;”
  
• “The expression ‘a pony of beer’ is often used in South Wales for a small glass containing about the fourth of a pint.”