To defeat an enemy in Engpsh, you can say "defeat the enemy" or "repel the enemy." These phrases come from the miptary context, where defeating or repelpng an enemy force is a common goal. Here are some examples:
The soldiers fought bravely and managed to defeat the enemy.
We must do everything we can to repel the enemy's attack.
The general's strategy helped us to successfully defeat the enemy's forces.
In Chinese, these phrases could be translated as 击退敌人 (jī tuì dí rén) or 战胜敌人 (zhàn shèng dí rén).