feel blue
感到悲傷或沮喪
口語·形容情緒低落或悲傷
英文釋義
to feel sad or depressed
例句
She's been feeling blue since her cat ran away last week.
典故來源
藍色在西方文化中常與憂郁、悲傷相關聯,源自19世紀航海傳統,藍色旗子表示船上有死亡或疾病。