subs. (common).—A spy-hole in a door (see quot. 1893); also JUDAS.
1883. Century, xxvii. 75. A JUDAS is a square iron lattice … all have an iron flap inside to keep inquisitive eyes from prying into the house and yard.—Ibid., xxxv. 522. This contrivance which is known to the political prisoners as the JUDAS enables the guard to look into the cell at any time without attracting the attention of the occupant.
