Definition of front line
(Entry 1 of 2)
b
: an area of potential or actual conflict or struggle
2
: the most advanced, responsible, or visible position in a field or activity
frontline
adjectiveDefinition of frontline (Entry 2 of 2)
1
: relating to, being, or involved in a front line
frontline ambulances
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Merriam-Webster unabridged
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Time Traveler for front line
The first known use of front line was circa 1797
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