Definition of "bullet-proof"

bullet-proof

adjective
comparative more bullet-proof, superlative most bullet-proof
1. Alternative spelling of bulletproof (all senses)
  Quotations
  The bullet-proof shutters, the stacks of hand-grenades, and the Gatling guns of the Sub-Treasury are tacit admissions of the fact and of the quality of the mercy expected.
  1890, Jacob A[ugust] Riis, “The Awakening”, in How the Other Half Lives: Studies among the Tenements of New York, New York, N.Y.: Charles Scribner’s Sons, page 20
verb
third-person singular simple present bullet-proofs, present participle bullet-proofing, simple past and past participle bullet-proofed
1. Alternative spelling of bulletproof