Meaning of blue box | Babel Free

Definitions

1. A blue container used for the collection of household waste (such as tin cans and newspapers) for recycling by a municipal authority.
   British, Canada
2. An electronic device used to bypass payment on a tone pulse telephone system.
   historical
3. A "tornado watch" notification category.
   US, informal
4. Ellipsis of USPS blue box.
   US, abbreviation, alt-of, ellipsis
5. Used other than figuratively or idiomatically: see blue, box.

Examples

“This was before Wozniak—known among the cognoscenti as Woz—almost woke up the Pope by calling the Vatican on his famed illegal "blue box," before he invented the Apple II and helped launch the personal computer industry, and before he gave up his brilliant engineering career and became a public school teacher.”

“See also: severe thunderstorm watch”

CEFR level