Dictionary

bulletproof

adjective bul·let·proof \ˈb-lət-ˌprüf also ˈbə-\

: made to stop bullets from going through

Full Definition of BULLETPROOF

1
:  impenetrable to bullets <bulletproof glass>
2
:  not subject to correction, alteration, or modification <a bulletproof argument>
3
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First Known Use of BULLETPROOF

1693
BULLETPROOF Defined for Kids

bulletproof

adjective bul·let·proof \ˈb-lət-ˌprüf\

Definition of BULLETPROOF for Kids

:  made to stop bullets from going through

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