Blue Box Definition

noun
An electronic device equipped with a tone pulsator that was formerly used to place free, illicit long-distance telephone calls by mimicking the tones sounded when operators routed such calls.
American Heritage

(chiefly UK and Canada) A blue container used for the collection of household waste (such as tin cans and newspapers) for recycling by a municipal authority.

Wiktionary

Other Word Forms of Blue Box

Noun

Singular:
blue box
Plural:
Blue Boxes

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blue box