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English definition of “the front line”

the front line

noun [S] uk   us  
a place where opposing armies face each other in war and where fighting happens: Tens of thousands of soldiers died at the front line. More front-line troops will be flown to the battle zone over the next few days.Places involved in military activity
(Definition of the front line from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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