down in the dumps心情跌到谷底。dump當名詞可表示垃圾堆或髒亂的地方，但它的原意並非如此。這個習語起源於18世紀，在當時，dumps指的是depression，也就是沮喪，而in the dumps再加上down（心情不佳），就能表示「跌到谷底的心情」
看看老外聊天時怎麼用down in the dumps：
Kevin: Why do you look so down in the dumps?
Tina: Things haven't been going smoothly for me at the car dealership.
Kevin: Are you still not getting along well with your boss?
Tina: It's not that. Well, I haven't sold a single car in over six weeks!
Kevin: Wow! That is terrible. What about the other sales people?
凱文：為什麼你看起來這麼沮喪呢？
蒂娜：我在汽車經銷商那裡做得不是很好。
凱文：你跟老闆還是處得不好嗎？
蒂娜：不是那樣的，我這六周多來沒賣出一輛車！
凱文：哇！還真糟，那其他銷售員怎麼樣？
down in the dumps例句精選：
She's feeling a bit down in the dumps and needs cheering up.
她情緒有點低落，需要振奮起來。
He was down in the dumps after losing his job.
他失業後，精神非常頹喪。
I burned midnight oil yesterday. So I feel down in the dumps today.
昨天我開了夜車，因此我今天感覺精神不太好。
I am down in the dumps about the defeat.
由於失敗，我沮喪極了。
拓展學習：
moody 鬱鬱寡歡的
downcast 心情低落的
light-hearted 心情愉快的
down in the mouth 心情低落
with a sense of melancholy 帶著一點憂鬱氣息