Common
Don't judge a book by its cover
English metaphorical phrase
Don't judge a book by its cover
The English idiom "don't judge a book by its cover", also known as "never judge a book by its cover", is a metaphorical phrase that means one should not judge the worth or value of something or someone by their outward appearance alone. For example, "That man may look very small and insignificant, but don't judge a book by its cover – he's a very powerful man in his circle".
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