blue box
noun
an electronic device used by phone phreaks to send out signals that unlock long-distance telephone circuits.
Origin of blue box
First recorded in 1975–80
Words nearby blue box
blue bag,
blue beret,
blue billy,
blue blood,
blue book,
blue box,
blue buck,
blue cataract,
blue catfish,
blue cattle dog,
blue cheese
British Dictionary definitions for blue box
blue box
noun
Canadian
a blue plastic container for domestic refuse that is to be collected and recycled