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blue box

an electronic device used by phone phreaks to send out signals that unlock long-distance telephone circuits.
Origin of blue box
1975-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for blue-box

blue box

(Canadian) a blue plastic container for domestic refuse that is to be collected and recycled
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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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)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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