あっと驚おどろく

expression, godan verb (-ku)

be astonished; get a big surprise; be taken aback

Expresses a sudden, strong surprise; often used when something unexpected happens and you react with a gasp or a start.

• 突とつ然ぜんの大おおきな音おとにあっと驚おどろいた。

  I was startled by the sudden loud noise.

• 彼かれの変かわりようにあっと驚おどろかされた。

  I was astonished by how much he had changed.