眉まゆを開ひらく

expression, godan verb (-ku)

feel relieved; forget one's troubles; find peace of mind

Idiomatic expression literally meaning 'to open one's eyebrows', used when worry or tension disappears and one feels at ease.

• 試し験けんが終おわって、やっと眉まゆを開ひらくことができた。

  After the exam was over, I was finally able to feel relieved.

• 彼かれの無ぶ事じを知しらされて、母ははは眉まゆを開ひらいた。

  Upon being informed of his safety, my mother's worries melted away.