幹かん流りゅう

noun

main current; main stream

Refers to the primary flow of a river, or metaphorically to the main trend or direction of something.

• この川かわの幹かん流りゅうは非ひ常じょうに速はやい。

  The main current of this river is very fast.

• 議ぎ論ろんの幹かん流りゅうから外はずれないようにしましょう。

  Let's not stray from the main stream of the discussion.