Structure
Noun + を境に
Noun + を境にして
Details
About を境に
を境に is a somewhat formal phrase used when a notable change has occurred. It is made up of the case-marking particle を, the noun 境 (meaning 'boundary' or 'border'), and the case-marking particle に. It may also be seen as を境にして, with the て-form of する.
を境に can be taken to more literally mean 'with (A) as a border', and is most often used with significant or radical changes, emphasizing a clear before and after, relative to a single point in time. As would be expected due to the use of the case-marking particle を, を境に will directly follow a noun.
を境に is commonly seen with points in time, however it may also be seen with specific events or things which have a clear 'border', such as specific sums of money, in some contexts.
Vocab Coverage
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Examples
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結婚を境に生活が大きく変わった。
After getting married, my life changed significantly.
30歳を境に食生活に気を遣うようになった。
From the time I turned 30, I started paying attention to my diet.
生後6ヶ月を境にして、赤ちゃんは周囲の人の顔をよりはっきり認識できるようになる。
From six months post-birth, babies become able to recognize the faces of people around them more clearly.
インターネットの普及を境に、情報の伝達速度は飛躍的に高まった。
After the proliferation of the internet, the speed of information transmission increased dramatically.
父は定年退職を境に人生初の海外旅行に行き、自らの価値観が大きく変わったようだ。
After his retirement, my father went on his first overseas trip, and his personal values seemed to have greatly changed.
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