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Definition of dumdum noun from the Oxford Advanced American Dictionary

 

dumdum

 noun
noun
NAmE//ˈdʌmdʌm//
 
(also dumdum bullet)
 
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a bullet that spreads out and breaks into many pieces when it hits someone It is named after the factory at Dumdum near Calcutta in India, where such bullets were originally made. They are now illegal.
See the Oxford Advanced Learner's Dictionary entry: dumdum