before you know where you are
成語所屬單字know
before you know where you are — 慣用語
1. Used to say that something happens very quickly or suddenly.
1.慣用語
釋義
轉眼間
Used to say that something happens very quickly or suddenly.
例句
The kids grow up before you know where you are.
Before you know where you are, the summer will be over.