してやる

godan verb (-ru), transitive verb

do for someone; do a favor

Expresses doing something for the benefit of another person, often with a nuance of condescension or doing a favor. The subject is the doer, and the action is directed toward someone else.

• 弟おとうとの宿しゅく題だいをしてやった。

  I did my younger brother's homework for him.

• 友とも達だちに料りょう理りを作つくってやるつもりだ。

  I plan to cook for my friend.

godan verb (-ru), transitive verb

take in; deceive; hoodwink

Used when someone is tricked or taken advantage of, often in a competitive or adversarial context. The subject deceives the object.

• あの詐さ欺ぎ師しにまんまとしてやられた。

  I was completely taken in by that con artist.

• 彼かれはライバルをしてやろうと企たくらんでいる。

  He is scheming to hoodwink his rival.