all of a heap

Adverb

colloquial idiomatic not-comparable

(colloquial, idiomatic) Into a sudden state of collapse or astonishment.

Japanese Meaning

突然崩れ落ちるような状態 / 急に驚愕し、意表を突かれる様子

手紙を読んでその意味に気づいた瞬間、彼女は呆然として近くの椅子に沈み込んだ。

Sense（1）

(colloquial, idiomatic) Into a sudden state of collapse or astonishment.

What caught me all of a heap was that million-dollar sense of beauty, youth, and happiness.