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English definition of “line”

line

noun [C] (MILITARY)    /laɪn/
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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