front line

boundary between two different positions (in a war, politics, etc.)

A front line is a line of confrontation in an armed conflict, most often a war. On either side of the front line stand the forces of the various combatants. In modern warfare, due to the broken nature of mechanized combat, front lines rarely form; instead a zone of confrontation comprises a wide band where forces engage in battle.
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Front line may mean:Front line in warfareOtherThe Front Line (documentary), a 1983 documentary on the El Salvador civil warThe Front Line (film), a 2006 Irish thriller written and directed by David GleesonFrontline (medicine), flea and tick medicineMusicThe Frontline, rap group from Richmond, CAThe Front Line, a New Jersey hardcore band, later known as U.S. ChaosFrontline (band), New Zealand Hip Hop groupFrontline (song), by alternative rock band CaptainFrontline Records (1980s), contemporary Christian record labelFrontline Records (1990s), drum and bass record label
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Noun
1. the line along which opposing armies face each other
(synonym) battlefront, front
(hypernym) line
(part-holonym) battlefield, battleground, field of battle, field of honor, field

Synonyms and related words:
DMZ, aceldama, advance guard, airhead, avant-garde, battle line, battle site, battlefield, battleground, beachhead, bridgehead, combat area, combat zone, enemy line, farthest outpost, field, field of battle, field of blood, firing line, first line, forefront, front, front rank, front-runner, killing ground, landing beach, line, line of battle, outguard, outpost, pioneer, point, precursor, railhead, scout, seat of war, shambles, spearhead, the front, theater, theater of operations, theater of war, van, vanguard, zone of communications
  

adj. ซึ่งเกี่ยวกับแนวหน้าของสนามรบ n. แนวหน้า (ทางทหาร), แนวรบด้านหน้า