Definition of popgun noun from the Oxford Advanced Learner's Dictionary

 

popgun

 noun
noun
BrE BrE//ˈpɒpɡʌn//
 
; NAmE NAmE//ˈpɑːpɡʌn//
 
 
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a toy gun that fires small objects such as corks and makes a short sharp noise
See the Oxford Advanced American Dictionary entry: popgun