愁眉苦脸 (chóuméikǔliǎn) = a worried, troubled expression (literally 'worry brows, bitter face'). Very common idiom.
culture
愁 appears frequently in classical Chinese poetry to express melancholy and longing. Li Qingzhao's famous line: 只恐双溪舴艋舟，载不动许多愁 (I fear the small boat cannot carry so much sorrow).
