Etymology

bulletproof

bul·let·proof
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Today it means: Capable of withstanding a direct shot by a bullet fired from a gun. Full definition →

English proof
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The story

  1. Englishbullet
  2. Englishproof
  3. English todaybulletproof

From bullet + -proof.

Etymology from Wiktionary, CC BY-SA 4.0.