brown在英语中最早的意思是“gloomy暗的、阴郁的”。由此，形成了一种悲观或严肃的感觉。而study除了表示学习，也指幻想、沉思，后来慢慢的brown study就用来指因为思考的太深入而出神、忧郁的状态，意思是苦思冥想、出神、放空。
in a reverie and absorbed in your thoughts
沉浸在遐想中
sb is in a brown study
某人在沉思,遐想
in a brown
冥思苦想中
例：I tried to attract his attention, but he was in a brown study.
我企图引起他的注意，但他在沉思而无所觉。
brown-nose
brown-nose是“阿谀奉承”的意思，尤其用于下级对上级，相当于俗语中的“拍马屁”、“马屁精”之意。下次如果见到有人对上司拍马屁，就可以说：He's brown-nosing. 当然，这里是朋友间开玩笑的话。
hard to please someone, especially someone in a position of authority, in a way that other people find unpleasant
拍马屁
例：
The rest of the class were sick of watching him brown-nose.班里的其他人讨厌看他拍马屁的样子。
brown-bag
这个表达的意思是你自己在家做午饭带到工作的地方去，而不用再出去买饭。因为最早人们用棕色的牛皮纸包装盒饭，慢慢就形成了这个固定搭配。
to take your own food to eat during the day, usually in a brown paper bag
(通常放在牛皮纸袋里的)自带午餐;便当
例：
The park has become a place where office workers brown-bag it and take leisurely strolls.
公园成为办公室职员在那里吃自带午餐，然后悠闲散步的地方。
browned off
annoyed
惹恼的
例：
I think she gets a bit browned off with him borrowing the car all the time.
他总是跟她借车，我想这有点惹恼了她。
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