Skip to main content
to judge a book by its cover

to judge a book by its cover

9 4.4
Decide something about a person or thing by how they look
  • idiom
  • Informal
translation icon : juzgar un libro por su portada
  • Try not to judge a book by its cover.
  • never judge a book by its cover
  • One should judge a book by its cover

And that's why you can't judge a book by its cover.

Autoplay Next

Examples

Synonyms

to prejudge
vsto judge a book by its cover
11 6.7

To form an opinion about a person or situation before you know all the facts

bases an opinion only on outward appearance rather than on facts

Antonyms

To recognize when someone is pretending or lying

Surface Forms

Morphology

judge + a + book + by + its + cover

The components 'judge', 'book' and 'cover' plus the preposition 'by' create a clear, literal mapping: forming a judgment about a book based on its cover. This metaphorical comparison is direct and cross-linguistically common, so a B1 learner who knows the constituents can readily infer it refers to forming an opinion from outward appearance.

Etymology

The idiom judge a book by its cover comes from the simple image of someone picking a book because of its bright cover instead of opening the book. So it means 'to form an opinion only from someone's or something's looks'.