Noun
defensive structure consisting of a barrier that can be employed for defense against attack
any organization whose responsibility it is to defend against something
Source: WordNetDefinitions are the guardians of rationality, the first line of defense against the chaos of mental disintegration. Ayn Rand
The Pacific no longer represents menacing avenues of approach for a prospective invader. It assumes, instead, the friendly aspect of a peaceful lake. Our line of defense is a natural one and can be maintained with a minimum of military effort and expense. Douglas MacArthur
Let me be clear. Our first line of defense is a simple message: Every group or nation must know, if they sponsor such attacks, our response will be devastating. George W. Bush
My first line of defense against reality is called sleep. Ashleigh Brilliant
Intelligence is our first line of defense against terrorism, and we must improve the collection capabilities and analysis of intelligence to protect the security of the United States and its allies. Saxby Chambliss
Each and every Notary Public plays a crucial role in combating identity theft. They serve as our front line of defense and the public is safer because of the job they do. Ken Salazar