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Noun: line of defense
Usage: US (elsewhere: line of defence)
  1. Any organization whose responsibility it is to defend against something
    "police are the major line of defense against crime";
    - line of defence [Brit, Cdn]
     
  2. Defensive structure consisting of a barrier that can be employed for defense against attack
    - line of defence [Brit, Cdn]

Derived forms: lines of defense

Type of: defence [Brit, Cdn], defense [US], defensive structure, organisation [Brit], organization