lamp post
n.— «Lamp-post: A rejected or a fictitious application for insurance.» —“Insurance Business” by Secured from Life Insurance agent Lexicon of Trade Jargon , 1938-39. (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...