line of defense
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|Noun||1.||line of defense - any organization whose responsibility it is to defend against something; "police are the major line of defense against crime"|
|2.||line of defense - defensive structure consisting of a barrier that can be employed for defense against attack|
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