Meaning of “you can't judge a book by its cover” in the English Dictionary

british dictionary

"you can't judge a book by its cover" in British English

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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 Learner’s Dictionary & Thesaurus © Cambridge University Press)