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Here are some phrasal verbs which are very similar to each other apparently but they have completely diffrent meanings, be cerful:

look up

Meaning: If a situation is looking up, it is improving, improve, get better:

Now the summer's here things are looking up!

look something up

Meaning: If you look up information in a book, on a computer etc, you try to find it there:

Look the word up in your dictionary.

look somebody up

Meaning: To visit someone you know, especially when you are in the place where they live for a different reason:

Don't forget to look me up when you come to Atlanta.

look up to somebody

Meaning: To admire or respect someone

I've always looked up to Bill for his courage and determination.