Eyebrows — the hairs above the eyes that shape facial expression and appearance.
彼女は眉毛を整えるのが上手だ。
She is good at shaping her eyebrows.
驚いて眉毛が上がった。
She raised her eyebrows in surprise.
眉毛が濃い人は顔立ちがはっきり見えることがある。
People with thick eyebrows sometimes have a more defined facial appearance.