Definition of blue box in English:

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blue box

noun

chiefly US An electronic device used to access long-distance telephone lines illegally.
Example sentences
  • In 1971, they manufactured hordes of the blue boxes and sold them to students in the Berkeley dorms.
  • Legend has it that the two novice entrepreneurs sold the blue boxes door-to-door on the Berkeley campus, several years before they founded their computer company.
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