Definition of bang exclamation from the Oxford Advanced Learner's Dictionary

 

bang

 exclamation
exclamation
BrE BrE//bæŋ//
 
; NAmE NAmE//bæŋ//
 
 
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used to show the sound of something loud, like a gun ‘Bang, bang, you're dead!’ shouted the little boy. Word Origin mid 16th cent.: imitative, perhaps of Scandinavian origin; compare with Old Norse bang ‘hammering’.
See the Oxford Advanced American Dictionary entry: bang