仇敵(きゅうてき)

bitter enemy

仇討(あだう)ち

revenge; avenging a grudge

仇役(かたきやく)

villain; antagonist

仇同士(あだどうし)

enemies; sworn enemies

仇(あだ)となる

to backfire; to work against someone

仇(あだ)を討(う)つ

to avenge oneself; to take revenge

仇(あだ)を返(かえ)す

to take revenge; to repay a grudge

亡(な)き父(ちち)の仇(あだ)を討(う)つため、彼(かれ)は長年剣術(ながねんけんじゅつ)を磨(みが)いた。

To avenge his deceased father, he honed his swordsmanship for many years.

仇敵(きゅうてき)との和解(わかい)は、長年(ながねん)の確執(かくしつ)を終(お)わらせた。

Reconciliation with the sworn enemy ended years of discord.