Definition of bulletproof adjective from the Oxford Advanced Learner's Dictionary

 

bulletproof

 adjective
adjective
BrE BrE//ˈbʊlɪtpruːf//
 
; NAmE NAmE//ˈbʊlɪtpruːf//
 
 
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that can stop bullets from passing through it a bulletproof vest
See the Oxford Advanced American Dictionary entry: bulletproof