急湍

jítuān
  1. (literary) rapid stream; rapid; torrent
  2. rapid stream; rapid; torrent

Wiktionary

Entry Composition

1 急 jí
  1. urgent
  2. pressing
  3. rapid
  4. hurried
  5. worried
  6. to make (sb) anxious
2 湍 tuān to rush (of water)