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Don't judge a book by its cover

Idiom: Don’t
judge a book by its cover
to not judge the quality or character of someone or something just by
looking at them

#1 – Students talking before the 1
day of class

Hey, Brad. Did you see the new English teacher? He looks so mean! I’m
afraid to go to his class.

But you haven’t even met him yet! Don’t
judge a book by its cover
Give him a chance before you form an opinion about him.

Hmmm. I guess you are right.

I’ve heard he is really funny! All the students who have taken his
class say he is the best teacher they have ever had in English.

really? OK. I’ll try his class and save my opinion for later.

#2 – Two friends at a party

Sami: Hi
Petra! Do you want to join us for lunch? We are going to “George’s

Petra: Ewww,
that place looks awful! It’s so tiny and everything is so plain. Why
don’t we go somewhere else for lunch.

Sami: Don’t
judge a book by its cover
Petra. “George’s Cafe” has the best sandwiches in town. All at a
very affordable price.

Really? Wow, I guess I shouldn’t judge it before I even try it.

Meaning: “Dont
judge a book by its cover

is said
when you cannot know what
something or someone is like by looking only
at that person or
thing’s appearance.
In the first context, Vanessa has a negative opinion of the teacher
based only on his appearance and that he looks “mean.” However,
Brad has heard that the teacher is really good, so he encourages
Vanessa to try the class and not base her opinion on just the looks
of the teacher. In the second context, the place they are going for
lunch is small and plain, so Petra has a bad opinion of it. However,
it’s actually a good place with the best sandwiches in town, so Sami
encourages Petra to try it and then form an opinion based on the
quality of the food.

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