Judas window n. an aperture or glass pane that permits safe or surreptitious observation through a door or wall. Editorial Note: This is a variation on Judas hole, Judas trap, or just Judas. (source: Double-Tongued Dictionary)
Further reading
The expression you look like death eating on a Nab means “you look terrible.” It’s a humorous elaboration of the idea of death, which refers to death consuming a dry, salty, peanut-butter-filled snack made by the Nabisco company...
“What has a head like a cat, feet like a cat, a tail like a cat, but isn’t a cat?” Answer: a kitten! A 1948 children’s joke book has lots of these to share with kids. Plus: an easy explanation for the difference between...