front line

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front-line

[fruhnt-lahyn]
adjective
1.
located or designed to be used at a military front line: a front-line ambulance helicopter.
2.
of, pertaining to, or involving the forefront in any action, activity, or field: a front-line TV reporter.
3.
highly experienced or proficient in the performance of one's duties.

Origin:
1910–15

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
front line
 
n
1.  military the most advanced military units or elements in a battle
2.  the most advanced, exposed, or conspicuous element in any activity or situation
3.  (modifier) frontline
 a.  of, relating to, or suitable for the front line of a military formation: frontline troops
 b.  (Brit) of, relating to, or suitable for public service and business employees who are in direct contact with the public: frontline staff
 c.  to the fore; advanced, conspicuous, etc: frontline news
 d.  of or relating to a country bordering on or close to a hostile country or scene of armed conflict: leaders of the frontline states attended the summit

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