down in the dumps
US /daʊn ɪn ðə dʌmps/
UK /daʊn ɪn ðə dʌmps/

1.
情绪低落, 沮丧, 郁闷
feeling unhappy or depressed
:
•
She's been down in the dumps ever since her cat ran away.
自从她的猫跑掉后,她一直情绪低落。
•
Don't be so down in the dumps; things will get better.
别这么垂头丧气;事情会好起来的。