Grammar › N1 · 02 Time and sequence
〜に至って(は): only when it reached ...; at the stage of
N1 · 02 Time and sequence
Says that only at an extreme stage did something finally happen or get noticed.
Noun or verb dictionary form + に至って(は). Usually the result is a late realization or action: 〜に至って初めて. Negative form 〜に至っても means "even at that point".
Examples
事態が深刻になるに至って、やっと会社は調査を始めた。
Only when the situation became serious did the company finally start an investigation.
倒れるに至って初めて、彼は自分の無理に気づいた。
Only when he collapsed did he realize he had pushed himself too hard.