line of defense
LYN of deh-FENTS
laɪn əv dɪˈfɛnsListen
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Dictionary meaning
a barrier, safeguard, protective measure, or category of defence arranged in sequential layers, so that if one fails a subsequent one can contain the threat; the military metaphor of defensive lines has been generalised to describe any system of layered protection in medicine, cybersecurity, public health, law, and organisational risk management; describing something as a first, second, or last line of defense conveys both the sequential logic of the protection system and the increasing urgency implied by the penetration of each successive barrier
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