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line

noun [C] (MILITARY)
 
 
/laɪn/

Definition

C2 a row of positions used to defend against enemy attack, especially the ones closest to enemy positions: They were taken prisoner while on a reconnaissance mission behind enemy lines.figurative In a game of football, the goalkeeper is the last line of defence.Places involved in military activity
(Definition of line noun (MILITARY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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