look up
表示原先在埋头干什么，之后抬头看
He looked up from his book as I entered the room.
我进入房间时，他从书本上抬起头来看了看。
(在词典、计算机等中)查阅
If there are words you do not understand, look them up in a dictionary.如果有不懂的单词就查字典。
look up to尊敬;仰视
I look up to him because he is a real artist.
我尊敬他，因为他是个真正的艺术家。
（反义词）look down
往下看，俯视
They can go up to the tower and look down.
他们可以登上高塔，向下俯视。
look down upon/on sb. (to think that you are better than sb.)瞧不起某人
Never look down on people who are not superior to you.
不要轻视不如你的人。