blue box

noun

an electronic device used by phone phreaks to send out signals that unlock long-distance telephone circuits.

Origin

1975-80

Examples from the web for blue box

Either way, the big difference between the two kits seems to be that one comes in a blue box and the other comes in a pink box.
There's probably ten grand in dead caterpillars in his padlocked blue box.
When it comes to macaroni and cheese, there are some who believe you can't beat the blue box.
Carefully packaged to appeal to consumers, the pill is a pretty pink-and-lavender capsule, available in a light blue box.
For instance, to compute the sum in the blue box below, start with the hundreds place.
Still and all, there is a great spot in my side yard for a blue box.
What's that mysterious looking blue box in the lower left corner.
Click within the blue box on any appeal listed below to view a summary.
Confirm the number shown in the blue box by entering it into the empty box.
For alternate routes, please see the dark blue box on the inside page detailing this closure.

British Dictionary definitions for blue box

blue box

noun

(Canadian) a blue plastic container for domestic refuse that is to be collected and recycled

Slang definitions & phrases for blue box

blue box

noun phrase

An electronic device enabling one to make long-distance telephone calls without paying: the alleged use of an electronic ''blue box'' to avoid telephone tolls (1970s+ College students)

blue box in Technology

operating system
The complete implementation of the Mac OS run-time environment on the more modern Rhapsody operating system. Blue Box is not an emulation layer; at any given time it will be based on the same source code and ROM image as the current version of Mac OS and will thus incorporate future Mac OS improvements.
(1997-10-15)