1.Black Friday 黑色星期五（每年11月的第4個星期五）

2.be in the black
如果講一個銀行賬戶in the black，說明里面還有一些錢。如果一個人或企業是in the black，那么他們在銀行還有存款，沒有負債。
Incredibly, we're still in the black after our holiday.
難以置信，度假之后我們在銀行還有存款！

3.a black day
A black day is a day when something very unpleasant or sad happens.
發生了一些很不開心的或者悲傷的事情的一天。
When we heard the news that Micheal Jackson had died, we knew it was going to be a black day for all of his loyal fans.
當我們聽到Micheal Jackson去世的消息，我們就明白這對于他所有忠實粉絲來說，將會是悲痛的一天。

4.as clear as black and white
表示極度明顯清晰，明顯界定或區別，沒有任何困惑或者含糊不清的空間
Love isn't always as clear as black and white, you know. You have to accept that there are many gray areas in relationships.
愛不總是黑白分明的，你知道嗎。在戀愛關系中你不得不接受里面許多的灰色地帶。

5.Devil is not so black as he is painted.
魔鬼并不像人們所畫的那么黑。
No one is as bad as people say he is. (which implies that people are saying too many bad things about someone.) I can't believe that actress is as mean as the gossip columns say she is. The devil is not so black as he is painted.
我不相信那個女演員真像八卦專欄上寫的那么尖酸刻薄。魔鬼并不像大家所畫的那么黑。

6.black out:
a.(for lights) to go out 熄滅。
Suddenly the lights blacked out. 燈都熄滅了。
b.昏倒，變得失去意識，斷片兒
Every time I drink, I always black out.
每次一喝酒我就斷片兒。
My problem is that whenever I go for a drink with my friends from home, we always take it too far, and before I know it, I black out!
每次我和家里的朋友們一起去喝酒，我們總是會喝太多，然后還沒反應過來，我就已經斷片兒了。