1.
brink, critical moment, tipping point
A crucial turning point where the outcome could go either way. Often implies urgency and high stakes.
Etymology
瀬戸 refers to a narrow strait where currents are strong and unpredictable, and 際 means edge or boundary. The word evokes being at the edge of a dangerous strait — a point of no return.
Usage
Often used in the pattern 〜の瀬戸際 (on the brink of ~). Carries a dramatic tone and is common in news reporting and formal speech. Similar to English "on the brink" or "at a crossroads."
Common collocations
Related Words
Synonym:
土壇場 (last moment)
Synonym:
崖っぷち (brink, informal)
Compare:
岐路に立つ (to stand at a crossroads)