frontline
adjective(front-line)
relating to, being, or involved in a front line
frontline
adjective(front-line)
first-rate; also : first-string
frontline
noun(front-line)
a military line formed by the most advanced tactical combat units; also : front
frontline
noun(front-line)
an area of potential or actual conflict or struggle
frontline
noun(front-line)
the most advanced, responsible, or visible position in a field or activity