尻けつを持もつ

expression, godan verb (-tsu)

take responsibility for; take the blame for

Slang expression meaning to cover for someone, often in a negative or illicit context. Implies backing someone up or taking the fall. Related to the noun ケツ持ち.

See also: ケツ持ち

• あの先せん輩ぱいはいつも後こう輩はいの尻けつを持もってくれる。

  That senior always takes responsibility for his juniors.

• 失しっ敗ぱいしたら、俺おれが尻けつを持もつから安あん心しんしろ。

  If you mess up, I'll take the blame, so don't worry.