メスを入いれる

expression, ichidan verb

perform surgery; operate; use a scalpel

Literal medical sense: to make an incision or perform a surgical operation.

• 医い師しは患かん部ぶにメスを入いれた。

  The doctor made an incision in the affected area.

• 緊きん急きゅう手しゅ術じゅつで、すぐにメスを入いれる必ひつ要ようがあった。

  In the emergency surgery, they had to operate immediately.

expression, ichidan verb

take drastic action; investigate thoroughly; get to the bottom of

Idiomatic extension: to tackle a problem head-on, often by exposing hidden issues or making a bold, decisive move. Common in business, politics, and journalism.

• 政せい府ふは汚お職しょく問もん題だいにメスを入いれると発はっ表ぴょうした。

  The government announced it would take drastic measures to address the corruption issue.

• この組そ織しきの非ひ効こう率りつな体たい質しつにメスを入いれなければならない。

  We must make a searching inquiry into the inefficiency of this organization.