noun

• (historical) In the United Kingdom and Ireland and many other countries, a unit of currency worth ¹⁄₂₄₀ of a pound sterling or Irish pound before decimalisation, or a copper coin worth this amount. Abbreviation: d.
  "Thanks to that penny he had just spent so recklessly [on a newspaper] he would pass a happy hour, taken, for once, out of his anxious, despondent, miserable self. It irritated him shrewdly to know that these moments of respite from carking care would not be shared with his poor wife, with careworn, troubled Ellen."
• (historical) In Ireland, a coin worth ¹⁄₁₀₀ of an Irish pound before the introduction of the euro. Abbreviation: p.

verb

• (slang) To jam a door shut by inserting pennies between the doorframe and the door.
  "Zach and Ben had only been at college for a week when their door was pennied by the girls down the hall."
• (electronics) To circumvent the tripping of an electrical circuit breaker by the dangerous practice of inserting a coin in place of a fuse in a fuse socket.
• (Oxbridge slang) During a meal or as part of a drinking game, to drop a penny in a person's drink with the expectation that they finish it (or some such variation thereof); commonly associated with crewdates at Oxford and swaps at Cambridge.
  "You got pennied! Down it, fresher."