それからというもの

expression

after that (a substantive change occurred); ever since then

Used to emphasize that a significant, often lasting change happened after a particular event. The phrase sets up a contrast between before and after.

• 彼かれは事じ故こに遭あって、それからというもの車くるまに乗のらなくなった。

  After his accident, he stopped driving cars altogether.

• 彼かの女じょは留りゅう学がくから帰かえって、それからというもの人ひとが変かわったように勉べん強きょうするようになった。

  Ever since she returned from studying abroad, she has been studying like a different person.