A marks a boundary, limit, or turning point
This can be used to mark off a location, a point in time, etc.
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父が倒れたのを境に母はめっきり元気が無くなった。
Mom became noticeably less healthy after Dad was bedridden.
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8
彼の日を境に彼は口数が少なく成った。
He became less talkative since that day.
0
Getting the sentences
Construction
(Elements in parentheses are optional.)
Basic Examples:
川を境に (using a river as a border)
Where this grammar is found
Grammar usage notes
を境に is used to mark a specific time, event, or situation as a turning point that divides “before” and “after.” It emphasizes a transition or change following the specified point and is often used in contexts like life events, historical moments, or personal milestones. The structure is event/time/action を境に、result/change/transition, and it works best when describing shifts in behavior, circumstances, or conditions. For example, 結婚を境に、生活が大きく変わった (Marriage marked a major change in my life). Unlike をもって, which indicates the start or end of something formally, を境に is more reflective, highlighting transitions or differences.
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