expression, godan verb (-ru)
hit the bull's-eye; be right on target
Used when a guess, remark, or criticism is exactly correct, often in a way that surprises or embarrasses the other person.
彼の指摘は図星に当たったようで、彼女は黙ってしまった。
His remark seemed to hit the bull's-eye, and she fell silent.
「もしかして、昨日サボったんじゃない？」「図星に当たった…」
"Did you skip work yesterday, by any chance?" "You hit the nail on the head..."