急きゅう流りゅう

noun, noun which may take the genitive case particle 'no'

swift current; rapids

Refers to a fast-flowing part of a river, often used in descriptions of nature, geography, or metaphorical rapid change.

• この川かわは急きゅう流りゅうが多おおいので、カヌーには向むかない。

  This river has many rapids, so it's not suitable for canoeing.

• 急きゅう流りゅうの音おとが遠とおくから聞きこえてきた。

  The sound of the swift current could be heard from afar.