you can't judge a book by its cover definition, meaning - what is you can't judge a book by its cover in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “you can't judge a book by its cover”

you can't judge a book by its cover

saying
said to show that you cannot know what something or someone is like by looking only at that person or thing's appearance
(Definition of you can't judge a book by its cover from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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