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first-line

American

[furst-lahyn] / ˈfɜrstˈlaɪn /

adjective

available for immediate service, especially combat service.

first-line troops.
of prime importance or quality.

first-line British

adjective

acting or used as a first resort

first-line treatment
first-line batsmen

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of first-line

First recorded in 1895–1900

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023