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English definition of “believe in sth”

believe in sth

verb [T] uk phrasal verb with believe   /bɪˈliːv/ us  
B1 to be certain that something exists: Do you believe in ghosts? B2 to be confident that something is effective and right: They don't believe in living together before marriage. He believes in saying what he thinks.
(Definition of believe in sth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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