Definition of bulletproof in English:

bulletproof

Syllabification: bul·let·proof
Pronunciation: /ˈbo͝olətˌpro͞of
 
/

adjective

Designed to resist the penetration of bullets: a bulletproof vest
More example sentences
  • Once you go in, as a member of the media, you're still behind a bulletproof, soundproof glass wall.
  • The shortage of those bulletproof vests has almost certainly cost several American lives.
  • His bulletproof vest was not safe enough, according to the Americans.

Definition of bulletproof in:

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Word of the day ween
Pronunciation: wēn
verb
be of the opinion; think or suppose