noun Date: circa 1797 1. a military line formed by the most advanced tactical combat units, an area of potential or actual conflict or struggle, the most advanced, responsible, or visible position in a field or activity
FRONT LINE
Meaning of FRONT LINE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012