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〜を境に(して)

from … on, since (a turning point)

Noun + を境に(して)

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を境に marks a clear dividing line in time, after which things were different: あの事故を境に、彼は変わった, "he changed after that accident".

境 means "boundary". The noun is a moment or event: an accident, a date, an age, a marriage. The second half is a change of state: stopped, began, became.

Compare をきっかけに (N2), "triggered by", which focuses on the cause that set something off. を境に focuses on the before-and-after contrast, and the event may not have caused the change at all: 四月を境に料金が上がる, "prices go up from April".

The deliberate "taking the opportunity to" is を機に (N1).

Examples

  • あの事故じこを境さかいに、彼かれは変かわった。

    He changed after that accident.

  • 四月しがつを境さかいに、料金りょうきんが上あがる。

    Prices go up from April.

  • 結婚けっこんを境さかいに、酒さけをやめた。

    He gave up drinking once he got married.

  • 三十歳さんじゅっさいを境さかいに、体力たいりょくが落おちてきた。

    Since turning thirty, my stamina has been going down.

  • その日ひを境さかいに、二人ふたりは口くちをきかなくなった。

    From that day on, the two of them stopped speaking to each other.

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