frontline
UK: /ˈfrʌntlaɪn/ | US: /ˈfrʌntlaɪn/
n. 1. The area where opposing forces engage in combat; the most advanced or exposed position in a battle.
n. 2. The forefront of an action or movement; a position of direct involvement or leadership.
adj. 3. Relating to the most essential or advanced part of an activity or field.
The word "frontline" combines "front" (from Old French front, meaning "forehead" or "foremost part") and "line" (from Latin linea, meaning "string" or "boundary"). Originally a military term, it referred to the literal line where troops faced the enemy. Over time, it expanded metaphorically to describe any leading or critical position in non-military contexts (e.g., healthcare, activism). The morphemes retain their original spellings, reflecting the word’s transparent compound structure.
Doctors and nurses worked tirelessly on the frontline during the pandemic.
The journalist reported from the frontline of the conflict zone.
This company is at the frontline of renewable energy innovation.
Soldiers held the frontline despite heavy enemy fire.
Teachers are often on the frontline of addressing social issues in classrooms.