(also judas hole)
A peephole in a door.
- If that's not a snapshot of Margo glaring through the judas hole in the door of her padded cell, then the Professor needs to sharpen the intuitive faculties with a sabbatical of his own in Byron Bay.
- The door had a judas hole, covered by a small shutter with an enormous lock.
Mid 19th century: from Judas Iscariot (see Judas1), because of his association with betrayal.