The hair above the eye (one on each side) — the eyebrow; an important facial feature for expression (often also called 眉毛).
彼女は眉を描くのが上手だ。
She is good at filling in her eyebrows.
驚いて彼は眉を上げた。
Startled, he raised his eyebrows.
表情は眉によって大きく変わる。
Expressions change greatly because of the eyebrows.