胸むな突つき八はっ丁ちょう

noun

the hardest part; the most trying stage

Refers to the most difficult or critical point in a long effort, often used for the final stretch of a task or journey. Originally from the steepest section of a mountain path.

• このプロジェクトは胸むな突つき八はっ丁ちょうに差さし掛かかっている。

  This project is reaching its most difficult stage.

• 登と山ざんは胸むな突つき八はっ丁ちょうを過すぎればあとは楽らくだ。

  Once you get past the steepest part of the climb, the rest is easy.