← Back to search

Meaning of rainbow box | Babel Free

Noun CEFR B2

Definitions

A supposed device used in phreaking, said to damage telephone lines by sending a high voltage through them; actually a hoax.

CEFR level

B2

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

See also

rainbow bridge rainbow cactus rainbow capitalism rainbow carrots rainbow ceiling rainbow chard