Definitions from Wiktionary (bulletproof)

▸ 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.
▸ verb:  To make proof against bullets.
▸ verb:  (slang) to make resistant to failure.
▸ Also see bulletproof

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