down in the mouth悲伤
【讲解】
该短语亦可作down at the mouth,用于口语中，表示“垂头丧气,悲伤,压抑”。
【对话】
A:What's the matter, Eric? You look down in the mouth today.
A:埃里克，怎么了？你今天看起来很伤心。
B:My girlfriend said good-bye to me.
B：我女朋友和我分手了。
A:Why did she leave you?
A:她为什么离开你？
B:I don't know. Maybe she just gets tired of me.
B:我不知道。也许是讨厌我了吧。