one-armed bandit
n.— «“One-armed bandits” is another name for fiddler crabs, and “butterballs” are better known as mole crabs or sand fleas.» —“Anglers don’t have to be in a pinch to use crabs” by Mike Marsh News & Observer (Raleigh, N.C.) Oct. 27, 2005. (source: Double-Tongued Dictionary)
Further reading
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...
Cat hair may be something you brush off, but cat hair is also a slang term that means “money.” In the same way, cat beer isn’t alcoholic — some people use cat beer as a joking term for “milk.” And imagine walking on a...