ˌfront ˈline BrE AmE noun
1 . [countable usually singular] the place where fighting happens in a war SYN front
in/on the front line
troops who had served in the front line at Magdeburg
three miles behind the front line
2 . in the front line
a) doing something that has not been done before:
in the front line of the fight against cancer
b) likely to be blamed for an organization’s mistakes
—ˈfront-line adjective [only before noun] :
front-line troops