English

Definition of BB gun noun from the Oxford Advanced Learner's Dictionary

 

BB gun

 noun
noun
BrE
 
; NAmE
 
(North American English)
 
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a long, light gun that uses air power to fire small round metal balls. BB guns are usually the first guns given to older children when they are learning to shoot. They use them to fire at targets (= objects fired at for practice) and to shoot small animals.
See the Oxford Advanced American Dictionary entry: BB gun