: a range of radio frequencies that people and especially truck drivers use to talk to each other over short distances often while driving
—often used before another noun
a CB radio
also
: a radio that uses this range of frequencies
We heard the truckers talking on the CB.
Note: CB is an abbreviation of "citizens band."
Cite this Entry
“CB.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/CB. Accessed 21 Jun. 2026.
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