1. (

• firewall

) (colloquial) the application of maximum thrust; "he moved the throttle to the firewall" ;

2. (

• firewall ,

) (computing) a security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers; commonly used on local area networks that are connected to the internet ;

3. (

• firewall

) a fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle ;