expression
obviously; of course; it goes without saying
Casual, somewhat old-fashioned or jocular expression meaning something is obvious or self-evident. Often used in lighthearted agreement or stating the obvious.
「彼はまた遅刻か」「あたりきだよ」
"He's late again?" "Obviously."
そんなのあたりきじゃないか。
That goes without saying, doesn't it?