light trap

noun

any mechanical arrangement that allows some form of movement to take place while excluding light, such as a light-proof door or the lips of a film cassette

See Empson yourself; he will put my stepper Mab to the light trap; no delay.

He went through the light trap to the next chamber and turned the handle on the sliding door.

Later they drove over in the light trap to look at the workshop, and here he made no excuses for its being small.

And as if in answer to her question, she suddenly caught sight of a light trap under the trees.

At its far-away end now trotted the Kentucky blacks, drawing a light trap.

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