一ひと思おもいに

adverb

instantly; resolutely; in one go

Describes doing something decisive, often with a sense of steeling oneself, such as ending a painful situation or making a difficult choice without hesitation.

• 彼かれは一ひと思おもいにその場ばを去さった。

  He left the place resolutely.

• 痛いたみを一ひと思おもいに終おわらせるために、彼かの女じょは注ちゅう射しゃを受うけた。

  To end the pain instantly, she took the injection.