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English definition of “peephole”

peephole

noun [C] uk   /ˈpiːp.həʊl/ us    /-hoʊl/ (UK also spyhole)
a small hole in a door or a wall through which you can look, especially without being seen: I have a security peephole in my front door.Holes, hollows and dips
(Definition of peephole from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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