甘あまい顔かおをする

expression, suru verb (irregular)

go easy on someone; be lenient; be soft on someone

Used when someone shows a forgiving or indulgent attitude, often when they should be stricter. Implies a soft expression or demeanor.

• 彼かれは生せい徒とに甘あまい顔かおをしすぎる。

  He is too lenient with his students.

• 上じょう司しが甘あまい顔かおをすると、部ぶ下かがつけあがる。

  If the boss goes easy on them, the subordinates will take advantage.