truth window
n.— «A truth window is a common thing that’s built into these rice straw buildings, because actually when they are covered with stucco it’s very difficult to tell, other than the very sort of soft look that the building has.» —“Listener Builds Straw Bale Winery” by Frederica Churchill Living on Earth Nov. 29, 1996. (source: Double-Tongued Dictionary)
Further reading
In the thriller Down Cemetery Road starring Emma Thompson, a character uses the Briticism safe as houses, meaning “quite safe,” an expression thought to derive either from the sturdiness of a house or the sense of real estate as a secure investment...
A librarian opens a book and finds a mysterious invitation scribbled on the back of a business card. Another discovers a child’s letter to the Tooth Fairy, tucked into a book decades ago. What stories are left untold by these forgotten...