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blue box

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noun
  1. an electronic device used by phone phreaks to send out signals that unlock long-distance telephone circuits.
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Origin of blue box

First recorded in 1975–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for blue box

blue box

noun
  1. Canadian a blue plastic container for domestic refuse that is to be collected and recycled
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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