line of defense

Thesaurus

Noun	1.	line of defense - any organization whose responsibility it is to defend against something; "police are the major line of defense against crime" line of defence organization, organisation - a group of people who work together
	2.	line of defense - defensive structure consisting of a barrier that can be employed for defense against attack line of defence abatis, abattis - a line of defense consisting of a barrier of felled or live trees with branches (sharpened or with barbed wire entwined) pointed toward the enemy defensive structure, defence, defense - a structure used to defend against attack; "the artillery battered down the defenses"