河か清せい

noun

clearing of river water; river becoming clear

Refers to the natural phenomenon of muddy river water becoming clear, often with classical or poetic overtones. Rare in everyday speech; more common in literary or historical descriptions.

• 古こ典てんでは、黄こう河がの河か清せいは聖せい人じんが現あらわれる瑞ずい兆ちょうとされた。

  In classical texts, the clearing of the Yellow River was considered an auspicious omen of a sage's appearance.