English Dictionary

wake up one day

動詞

To undergo an overnight change, often an unprecipitated one -- used with and

日本語の意味

ある日突然、意識や感情、生活態度などが変化すること / 何の予告もなく、一晩のうちに自分の考え方や行動が急に変わる状態 / 突如として目覚めるとともに、内面や対応が一変する現象

A few years ago she used to be painfully shy, but she seemed to wake up one day and start speaking confidently at meetings.

数年前、彼女は非常に内気だったが、ある日突然、会議で自信を持って話すようになった。

意味（1）

To undergo an overnight change, often an unprecipitated one -- used with and

The feud between the Hatfields and the McCoys must have been fueled by some event, as no reasonable person would wake up one day and decide they hated everyone in the other family.