old gentleman

English

Noun

old gentleman (plural old gentlemen)

1. (UK, slang, obsolete) A playing card that is almost imperceptibly longer than the others in the deck, used by cheats.
2. Used other than figuratively or idiomatically: see old,‎ gentleman.

References

• Edward Samuel Taylor (1865) The History of Playing Cards
• John Camden Hotten (1873) The Slang Dictionary