noun
a position of defense or resistance
adjective
relating to or characteristic of a front line
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The soldiers on the front line displayed immense bravery in the face of danger.
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The workers on the front line are the ones who deal with all the difficult customers.
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I can't believe she's been on the front line for so long, she must be exhausted.
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In the battle against poverty, education is on the front line fighting for a better future.