seat of ease
n.— «Taking medicine meant swallowing improbable quantities of calomel, suphur, Turkey rhubarb (often added to their own surgeon’s prescription) and spending the whole of the next day on the seat of ease, gasping, straining, sweating, ruining their lower alimentary tract.» —by Patrick O’Brian The Truelove May 1, 1992. (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...