noun
worried look; melancholy air
Literary noun describing a facial expression of worry or sadness. Most often encountered in the set phrase 愁眉を開く (to feel relieved, to brighten up).
彼の冗談に、ようやく彼女も愁眉を開いた。
At his joke, she finally brightened up.
試験が終わって、学生たちは愁眉を開いた。
After the exam, the students looked relieved.