two-way mirror

British  

noun

1. a half-silvered sheet of glass that functions as a mirror when viewed from one side but is translucent from the other

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Example Sentences

“The movie is interested in the sadness, loneliness or perhaps even sinister nature of emotionally investing so deeply in fandom,” Schoenbrun says, likening it to a two-way mirror.

From Los Angeles Times

Thrilling, but also cortisol-spiking; the sense of being trapped like animals in a zoo is intensified by an obsidian two-way mirror on Wilson Chin’s spartan set.

From New York Times

We stood behind a two-way mirror and watched the people interact there for half an hour before they came into the focus room, which we also watched from behind a mirror.

From Los Angeles Times

At best, you’re on the other side of a two-way mirror, hoping the disease really can’t see you.

From Washington Post

Plotz’s hope that “Two-Way Mirror” will “inspire a new generation of readers” neglects the past 25 years, during which students of Victorian poetry would have needed an especially stubborn amnesia to avoid the possibility of finding inspiration in Barrett Browning’s poetry.

From New York Times