Definition of "front line" [front line]

• A front, or a boundary between opposing positions. (noun)
• A site of a conflict, effort, or controversial matter of any kind. (noun)
• The site of interaction with outsiders, such as customers. (noun)
• A low level. (noun)
• Attack, collectively the attackers or forwards. (noun)

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• "But with so many heavily armored cavalrymen on the Persian lines extending beyond his own front line on both the right and left, it seemed an impossible situation."
• "This meant the Macedonian front line struck the Illyrian troops on their left, while the right side of the Illyrian line watched."
• "He personally led his infantry forward against the Illyrians, though instead of striking their front line head-on, he employed a seemingly odd strategy of hitting the enemy with an angled formation."