frontline
adjective
- located at front
Wiktionary
adj
Etymology: From front + line.
- Located at a front.
- Most advanced or important.
“Concerns have been raised about available luggage space, with Cash remarking: "With the upcoming Christmas period there will likely be a large increase in health and safety issues and stress for frontline staff."”
noun
Etymology: From front + line.
- Alternative form of front line.