Definition of blue box in English:
chiefly US An electronic device used to access long-distance telephone lines illegally.
- 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.
Definition of blue box in:
- British & World English dictionary