Definition of believe in phrasal verb from the Oxford Advanced American Dictionary

 

believe in

 phrasal verb
phrasal verb
 
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Phrasal Verbs

believe in somebody/something

 
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to feel certain that someone or something exists Do you believe in God?

believe in somebody

 
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to feel that you can trust someone and/or that they will be successful They need a leader they can believe in. I never thought I could make it as an actor, but my parents always believed in me. Thesaurustrustdepend on somebody/something rely on somebody/something count on somebody/something believe in somebodyThese words all mean to believe that someone or something will do what you hope or expect of them, or that what someone tells you is correct or true.trust to believe that someone is good, honest, sincere, etc. and that they will do what you expect of them or do the right thing; to believe that something is true or correct:You can trust me not to tell anyone. Don't trust what you read in the newspapers!depend on/upon somebody/something (often used with can/cannot/could/could not) to trust someone or something to do what you expect or want, to do the right thing, or to be true or correct:He was the sort of person you could depend on. I can't depend on my own strength ever since I got sick.rely on/upon somebody/something (used especially with can/cannot/could/could not and should/should not) to trust someone or something to do what you expect or want, or to be honest, correct, or good enough:Can I rely on you to keep this secret? You can't rely on any data you get from them.trust, depend, or rely on/upon somebody/something?You can trust someone's judgment or advice, but not their support. You can depend on someone's support, judgment, or advice. Rely on/upon somebody/something is used especially with you can/could or you should to give advice or a promise:I don't really rely on his judgment. You can't really rely on his judgment.count on somebody/something (often used with can/cannot/could/could not) to be sure that someone will do what you need them to do, or that something will happen as you want it to happen:I'm counting on you to help me. We can't count on the weather.believe in somebody to feel that you can trust someone and/or that they will be successful:They need a leader they can believe in.Patterns to trust/depend on/rely on/count on somebody/something to do something to trust/believe in somebody/something to trust/depend on/rely on/count on somebody's advice/judgment to depend on/rely on/count on somebody's support to trust/depend on/rely on/believe in somebody/something completely

believe in something

 
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to think that something is good, right, or acceptable I don't believe in hitting children. Do you believe in capital punishment?
See the Oxford Advanced Learner's Dictionary entry: believe in