Definition of "spy-hole" []

• A hole for spying; a peepnole. (noun)

The Century Dictionary (Public Domain)

• "The door with the spy-hole to the cave in the Church of the Nativitymarks the line between the western, Catholic side of the church andthe eastern Orthodox sector."
• "The eye which had been observing him for several minutes through the spy-hole withdrew."
• "Rubashov went to the spy-hole and looked over to No. 407, who had stretched out his hands for the bread."