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Entry 3 senses Webster, 1913

bullet-proof

· bul·let-proof · IPA
01 a. Capable of resisting the force of a bullet; resistant to penetration by a bullet; armored; as, a bulletproof vest; a bulletproof window.
  1. 1.
    Capable of resisting the force of a bullet; resistant to penetration by a bullet; armored; as, a bulletproof vest; a bulletproof window.
  2. 2.
    designed so as to be resistant to abuse or misuse and incapable of malfunction under normal use; as, a bulletproof computer program.
  3. 3.
    so well thought out as to be resistant to criticism or certain to succeed; as, a bulletproof plan.