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bulletproof
01
built in a way that does not let through any bullets or other projectiles
Examples
The bulletproof vest saved the officer's life during the shootout.
02
guaranteed to bring success or survive challenges or criticism without being affected
Examples
The new security system was designed to be virtually bulletproof against cyberattacks.
to bulletproof
01
to make resistant or impervious to bullets
Examples
The armored car was bulletproofed before the VIP arrived.
02
to make something extremely secure, strong, or fail-safe
Examples
The company bulletproofed its IT system against cyberattacks.
