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

Derived forms: lines of defence

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

Encyclopedia: Line of defence