肝きもを据すえる

expression, ichidan verb

resolve oneself; steel one's nerves; do with determination

Used when someone prepares mentally for a difficult or frightening task, often implying a conscious decision to face it without flinching.

• 彼かれは肝きもを据すえて、大だい観かん衆しゅうの前まえでスピーチを始はじめた。

  He steeled his nerves and began his speech in front of the large audience.

• 試し験けんの前まえは、肝きもを据すえて最さい後ごの復ふく習しゅうに取とり組くんだ。

  Before the exam, I resolved myself and tackled the final review.