プログレッシブ和英中辞典(第4版)の解説
あっといわせる【あっと言わせる】
astonish; take ((a person)) by surprise
今にみろ．君たちをあっと言わせてみせるからな
You just wait! You'll be surprised all right.
彼はその奇抜な学説で世間をあっと言わせた
He 「astonished the public [caused a sensation] with his novel theory.
見事な手品で皆をあっと言わせた
His trick was so exquisite that it took people's breath away.
世間をあっと言わせることは何もしなかった
He didn't do anything to set the world [《英》 the Thames] on fire.