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the area where opposing forces meet or engage, often in a military conflict
the center of action or the most critical position in a struggle or activity
What does "front line" mean in slang?
The structure combines "front" (forward or leading) with "line" (a boundary or position), forming a noun phrase borrowed directly from military terminology. It is used to describe the center of action or the most critical position in a struggle or activity, whether in a war, a business, a social movement, or any competitive field. People typically say they are "on the front lines" when they are directly involved in the most intense or important part of a mission, such as healthcare workers during a pandemic or customer service representatives handling complaints.
