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English definition of “look sth up”

look sth up

verb uk phrasal verb with look   /lʊk/ us  
B1 to try to find a piece of information by looking in a book or on a computer: If you don't know what the word means, look it up in a dictionary.
(Definition of look sth up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of look sth up?
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