Pronunciation: (bool'it-prOOf"), [key]
1. (of vehicles, glass, clothing, etc.) capable of resisting or absorbing the impact of a bullet.
2. Informal.safe from failure; without errors or shortcomings and beyond criticism: a bulletproof system; a bulletproof budget.
to make (something) bulletproof.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.