a critical moment, a crossroads, a brink

💡 Nuance & Usage: Refers to a crucial moment or a critical juncture where the outcome of something is highly uncertain and important, often implying danger or an impending crisis. 物事の成否や運命が決まる、非常に重要な局面やぎりぎりの状況。「〜の瀬戸際に立つ」のように使う。