“Peephole” in Japanese
Short answer
Peephole in Japanese is “覗き窓” (nozokimado). Full meaning: peephole (e.g. in a door), observation window, viewing window.
Other ways to say “Peephole” in Japanese
覗き穴
nozokiana peephole, spyhole, inspection hole, observation window
のぞき窓
nozokimado peephole (e.g. in a door), observation window, viewing window
のぞき穴
nozokiana peephole, spyhole, inspection hole, observation window
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