腰こしを入いれる

expression, ichidan verb

take a solid stance; settle into a stable posture

Literally to put one's hips into a position; used in physical contexts like martial arts or heavy lifting where a stable lower-body stance is needed.

• 柔じゅう道どうでは、まず腰こしを入いれて構かまえることが大たい切せつだ。

  In judo, it's important to first settle into a solid stance.

expression, ichidan verb

put one's back into it; exert oneself; get serious

Figurative extension: to commit oneself fully to a task, similar to 本腰を入れる. Often used when someone finally starts working earnestly.

See also: 本腰を入れる

• 彼かれはようやく腰こしを入いれて勉べん強きょうを始はじめた。

  He finally put his back into his studies and started.

• 腰こしを入いれて仕し事ごとに取とり組くめば、結けっ果かはついてくる。

  If you put your back into your work, results will follow.