1、not worth a red cent
一文不值
例句：
I don't know how I'm going to tell that woman that her prized collectibles are not worth a red cent.
我不知道我要怎麼告訴那位女士，她珍貴的收藏品其實一文不值。
2、a red eye夜間航班。
例句：
We took the red eye from Seattle to NewYork.
我們從西雅圖乘深夜航班去紐約。
3、a red-letter day非常重要或特別的一天
例句：
The day our daughter was born was a real red-letter day for us.
我們女兒出生的那一天對我們來說真的是非常特別的一天。
4、(boy,) is my face red! 尷尬
例句：
I can't believe I was calling my client by the wrong name. Boy, is my face red!
我不敢相信我竟然叫錯了客戶的名字。真是太難堪了!
5、red as a cherry 亮紅;緋紅
例句：
When her boss praised her in front of the whole office, Emily turned red as a poppy.
當Emily的老闆在整個辦公室前讚賞她，她臉一下子就紅了。
6、red tape繁文縟節
例句：
My passport application has been held up by red tape.
我的護照申請被繁文縟節擱置了。
7、see red 非常生氣。
例句：
When he laughed in my face, I just saw red.
他嘲笑我的臉時，我非常生氣。
8、red ink債務;債務在財務報表中用紅色墨水錶示。
例句：
There is too much red ink in my financial statement.
我的財務報表裡太多赤字了。
和它相對的是：out of the red擺脫債務;有盈利能力。
例句：
This year our company is likely to get out of the red before fall.
今年我們的公司在秋季之前可能就擺脫赤字了。
9、paint the town red晚上出去玩得開心，經常是喝很多酒，還跳舞
例句：
They were out painting the town red last night.
他們昨晚出去嗨了。