believe in

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believe in (someone or something)

1. To have confidence in one's or someone else's abilities. I don't usually believe in myself, so I'm trying to think more positively these days. I'm sure you'll do great in the interview—I believe in you!
2. To be convinced of the existence of something. My little girls believe in unicorns, magic spells, all that fun stuff. She says she doesn't believe in ghosts, so send her into the haunted house.
3. To subscribe to the tenets of something or value its perceived merits. I believe in democracy, which is why I vote in every election. If you don't believe in this process, you shouldn't be participating in it.
See also: believe
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

believe in someone or something

to trust or have faith in someone or something; to accept a fact or what someone says as truth. You must believe in your own abilities. I believe in myself and my talent.
See also: believe
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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