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Meaning of violet box | Babel Free

Noun CEFR B2

Definitions

A device used in phreaking, employing a resistor to hold a payphone line open when it would usually be cut off.

CEFR level

B2

Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.

See also

violet carpenter bee violet gold Violet Hill violet noise violet phosphorus violet ray