ドアスコープ

noun

peephole; door viewer

A small lens installed in a door to see who is outside. Wasei-eigo from 'door scope'; in English usually called a peephole or door viewer.

wasei-eigo (Japanese-coined English), from door scope

• ドアスコープから外そとを見みると、知しらない人ひとが立たっていた。

  When I looked outside through the peephole, a stranger was standing there.