VERB
（彻底）征服，击败，战胜
To vanquish someone means to defeat them completely in a battle or a competition.
例句
A happy ending is only possible because the hero has first vanquished the dragons...
只有主人公先把那些恶龙制服，才有可能实现大团圆结局。
With knowledge and wisdom, evil could be vanquished on this earth.
拥有了知识和智慧就能够把恶势力从这个世界上铲除。