door-knocker
n.— «He said if that situation arises they will give them food and water and will leave a door knocker and hopefully the resident will come home and take care of the animal.» —in Wayne Gilley City Hall Council Chamber Lawton City Special Council Meeting (Lawton, Oklahoma) Apr. 10, 1997. (source: Double-Tongued Dictionary)
Further reading
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...
Have you ever googled your own name and found someone else who goes by the very same moniker? There’s a word for that: googleganger. Plus, the language of hobbyists and enthusiasts: If you’re a beekeeper, perhaps you call yourself a...