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。
英汉词典释义
vt.
<文>征服,战胜
She had fought many battles, vanquished many foes.她身经百战,挫败过很多对手。
克服;抑制
He tried to vanquish his fears.他努力克服恐惧心理。
英英词典释义
Verb
1. come out better in a competition, race, or conflict;
"Agassi beat Becker in the tennis championship""We beat the competition""Harvard defeated Yale in the last football game"