さてこそ

adverb

just as I thought; as expected

Expresses that a situation has turned out exactly as the speaker anticipated. Often used when a prediction is confirmed, sometimes with a tone of resignation or satisfaction.

• さてこそ、彼かれは来こなかった。

  Just as I thought, he didn't come.

adverb

that's why; no wonder

Used to indicate that a preceding fact explains the current situation. Similar to 'that explains it' or 'so that's why'.

• さてこそ、彼かれが遅ち刻こくしたわけだ。

  That's why he was late.