境目|さかいめsakaime[4]odaka (tail-high)

1. nounborderline; boundary

• Synonym境さかいNeutralA border or boundary, also a realm or state such as 「生死の境」; more written than 「境目」.
• Synonym分かれ目わかれめNeutralA fork or turning point, stressing where fates or outcomes part ways, as in 「勝敗の分かれ目」.
• SynonymボーダーラインNeutralA loanword for a borderline, often meaning the pass/fail line, as in 「ボーダーライン上」.
• Synonym境界線きょうかいせんNeutralA drawn boundary line, more formal and written in tone; 「境目」 is colloquial and stresses where two things meet.
• Synonym分け目わけめNeutralMainly the parting in one's hair, and also a decisive moment, as in 「天下分け目の戦い」; it can mean a dividing line too, close to 「境目」.
• RelatedボーダーNeutralA loanword for border or boundary, also used for horizontal stripes; versatile in its uses.
• Related境域きょういきWrittenThe boundary or extent of land or territory; a rare written word, while 「境目」 is common in speech.
• Related分界ぶんかいWrittenA written, formal word for demarcation, stressing the drawing of dividing lines, as in 「分界線」.
• Related区割りくわりWrittenDividing up an area, stressing administrative zoning such as electoral districts.
• RelatedバウンダリーNeutralA loanword for boundary, used in geography, technology, personal relationships and the like; uncommon in daily speech.
• Antonym内部ないぶNeutralThe inside or interior, as in 「建物の内部」— the opposite of 「境目」 at a boundary.
• Antonym中心ちゅうしんNeutralThe center or middle, as in 「町の中心」— opposite to 「境目」 at the edge where things meet.

For where two things meet, say 「境目」 in speech, as in 「県の境目」「夢と現実の境目」. Use 「境界線」 for a drawn line, 「分かれ目」「分け目」 for a decisive divide, and 「ボーダーライン」 for a pass/fail line. The opposites are 「中心」 and 「内部」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 境界きょうかい。
2. 物事ものごとの分れ目わかれめ。