天てん王のう山ざん

noun

decisive point; turning point; watershed moment

Metaphorical use derived from the historical Battle of Yamazaki (1582), where Mount Tennōzan was the strategic key. Used for a critical juncture in a competition, project, or series of events.

• この試し合あいが優ゆう勝しょうへの天てん王のう山ざんだ。

  This match is the decisive point on the way to the championship.

• プロジェクトの天てん王のう山ざんは来らい月げつのプレゼンだ。

  The watershed moment for the project is next month's presentation.