Definition of look up phrasal verb from the Oxford Advanced American Dictionary

 

look up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

look up

(informal)
 
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(of business, someone's situation, etc.) to become better synonym improve At last things were beginning to look up.

look up (from something)

 
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to raise your eyes when you are looking down at something She looked up from her book as I entered the room.

look somebodyup

[no passive](informal)
 
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to visit or make contact with someone, especially when you have not seen them for a long time Look me up the next time you're in San Francisco.

look somethingup

 
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to look for information in a dictionary or reference book, or by using a computer Can you look up the address on the Web site? I looked it up in the dictionary.
See the Oxford Advanced Learner's Dictionary entry: look up