American English

Definition of CB noun from the Oxford Advanced American Dictionary

 

CB

 noun
noun
NAmE//ˌsi ˈbi//
 
[uncountable]
 
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the abbreviation for“Citizens' Band”(a range of waves on a radio on which people can talk to each other over short distances, especially when driving) A truck driver used his CB radio to call for help.
See the Oxford Advanced Learner's Dictionary entry: CB