Frontline
Definition 1 of 2

Context
The term 'frontline' can have different meanings in different situations, from military to healthcare. For example, frontline workers in health provide critical services during crises.

During the pandemic, nurses were considered the frontline workers of healthcare.
Urgency
When something is described as being at the frontline, it implies immediate importance or priority.

We need to address the frontline issues affecting our community now.
Metaphor
Using 'frontline' metaphorically can describe any leading edge in various situations, not just military.

In the tech industry, startups are often at the frontline of innovation.
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