Examples
“Alone in a stripped room, it will be nearly impossible for him to act suitably engaged and hence nearly impossible to act sane, and so the patient may try to cover up the judas-hole in the cell door in order to prevent passers-by from transforming a private predicament into a social situation.”
Lists
These user-created lists contain the word ‘judas-hole’.
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The Aubrey/Maturin List I'm Gonna Mak...
I'm wading through Patrick O'Brian's Aubrey/Maturin novels one by one, and someday, I'll wade through them again and list all the words I learned while reading them.
Edit: I started ma...studdingsail, carronade, mumchance, grumlin-futtocks, crosscat-harpings, holystone, sennit, orlop, orchitis, negus, kevel, altumal and 1112 more...
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Holes
judas, judas-hole, hole, creephole, pinhole, spy-eye, blowhole, breathing-hole, spiracle, touchhole, mouth, cakehole and 166 more...
Tweets
Looking for tweets for judas-hole.

chained_bear "They ate their meals in what had been the nuns' parlour, an austere room, scarcely changed but for stouter bars at the windows, a judas-hole at each of the outer doors and a number of English inscriptions..."
--Patrick O'Brian, The Surgeon's Mate, 316 Feb 9, 2008