I. ˈ ̷ ̷| ̷ ̷ adjective
Etymology: front line
: situated or suitable for use at the front
a new frontline ambulance — Army Reserve Training Bulletin
: relating to advance activity or procedure
frontline agricultural news — Atlantic
in the cultural struggle … the schools are the frontline trenches — Paul Blanshard
II. adjective
: first-rate
frontline teachers
also : first-string
a frontline goalie