frontline

front·line also front line  (frntln)

n.

1. A front or boundary, especially one between military, political, or ideological positions.

2. Basketball See frontcourt.

3. Football The linemen of a team.

4. Sports The players who play farthest forward, as in volleyball.

adj. or front-line

1. Located or used at a military front.

2. Of or relating to the most advanced or important position or activity in a field or undertaking: "leaders of the six black 'front-line states' bordering South Africa" (Boston Globe).

3. Sports

a. Of or relating to the frontline.

b. Being a member of the regular team; first-string: a team in need of a frontline catcher.