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Douglas Harper's Etymology Dictionary
front-line

also frontline, 1842 in the military sense, from front (adj.) (1520s, from front (n.)) + line (n.). As an adjective from 1915.

Wiktionary
front-line

a. (alternative spelling of front line English)

Usage examples of "front-line".

BEBRA'S TROUPE: Bebra's front-line theater sings for you, plays for you, boosts your morale for the final victory.

This principle arranges a nation's cryptosystems in a hierarchy in which front-line systems are simple and diplomatic systems secure and more complex.

I didn't know anything about his background: he could be a major element in something big the Bureau was running or he could be coming across with the blueprints of the Russian fleet, but even if he were only a contact or a courier he had to get a front-line interceptor airborne out of a military base and he had to go like hell through a gauntlet of radar stations that would trigger off signals to every air police unit along the north Mediterranean before he was across the Italian Alps.

Shinhaa Harkka commanded an impressive number of ships, but the mix of types was decidedly on the light side by the standards of today's battle fleets: no monitors, only four assault carriers, and twenty-four superdreadnoughts, as contrasted with twenty fleet carriers, sixty battleships, forty-two battlecruisers, and ninety of the heavy cruisers the TFN deemed too small for front-line service.

They were all in battle-armor, though, a technical commando unit tasked with front-line electronic reconnaissance.

Gerald Hott was a front-line warrior who kept his freezer locker as clean as an operating room and so it is only fitting that he has ended up there.

That’s why most front-line troops carry C-14 Impalers, gauss rifles that fire eight-millimeter spikes.

And finally the Necroscope located himself at the head of the column of flyers, so that he would be the first to note any retreat of the lieutenants from their front-line positions.

This released squadron after squadron for front-line duty in his next great onslaught.

By making Dan Berrigan or Angela Davis the beneficiary you might avoid front-line duty.

He flew his first combat mission as replacement for a ZBL-4 Helmsman who had fractured her leg the previous evening at the local officer's mess--clear indication of front-line meem consumption.

Hackworth had arrived at the point where he frankly didn't care, and so he stared directly at these men, front-line soldiers of their various microstates, as each one primly folded his navy blue suit jacket and elbow-crawled into a coffinlike microcabin like a GI squirming under a roll of concertina wire, accompanied or not by a camp follower.

At a speed which bewildered him, he was sent to Korea, not with a formed unit but to a replacement depot, a repple depple he explained to his parents, and from there he was sent to a front-line company guarding a sector along the thirty-eighth parallel.

Under cover of darkness, the battalion infiltrated the enemy front-line positions and seized the high ground commanding the main German military supply route west of Zerf.

In the Federation, men and women enjoyed total equality of status and opportunity from pipe-cleaning in the A-Level sewage farms to the top executive suite in the Black Tower and in front-line combat against the Mutes.