Meaning of とたんに in Japanese

Definition of とたんに

とたんに(totanni) 【途端に】

(adv) just as; in the act of
その知らせを聞いたとたんに、彼は青ざめた。
On hearing the news, he turned pale.

僕ぼくは見たとたんに彼女かのじょだと分かった。

I recognized her the moment I saw her.

僕ぼくは見たとたんにメアリーだとわかった。

I recognized Mary the moment I saw her.

Scarcely had the market opened before the fire broke out.

I had hardly sat down on the bench when I found it had just been painted.

バスばすを降りたとたんに、彼女かのじょは名前なまえを呼ばれるのを聞いた。

On getting off the bus, she heard her name called.

No sooner had Tom turned on the TV than the fuse blew.

ドアを開けたあけるとたんに、彼かれは焦げ臭いこげくさい匂いにおいを嗅いだ。

The instant he opened the door, he smelt something burning.

The moment she heard the news, she turned pale.

On hearing the news, he turned pale.

On hearing the news, she turned pale.