Other forms: frontlines
The frontline is the place where the fighting actually happens. On the frontline, frontline troops, frontline staff.
The figurative use is now the commoner, and frontline staff means the people who deal with the public rather than anybody in an office. In war the line is rarely a line at all.
1nounfrontlineThe place where the fighting actually happens.
“The soldiers spent three months at the frontline before they were sent home.”
frontline is a place.
Front plus line, from the forward edge of an army's position.
From front + line.
Etymology from Wiktionary, CC BY-SA