Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Impenetrable by bullets.
  • adjective Informal Impervious to assault, damage, or failure; guaranteed.
  • transitive verb To make impenetrable by bullets.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective of a material Capable of withstanding a direct shot by a bullet fired from a gun.
  • adjective idiomatic reliable, infallible, sturdy or error-tolerant.
  • adjective Unbreakable, very tough.
  • verb To make proof against bullets.
  • verb slang to make resistant to failure.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

bullet +‎ -proof

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