you can't judge a book by its cover
It is not possible to make reliable judgments about things or people by considering external appearances alone.
cover
UK /ˈkʌvɚ/ US /ˈkʌvɚ/
noun 5verb 5adj 2name 2
Definitions
noun
1
A lid.
2
Area or situation which screens a person or thing from view.
The soldiers took cover behind a ruined building.
3
The front and back of a book, magazine, CD package, etc.
4
The top sheet of a bed.
5
A cloth or similar material, often fitted, placed over an item such as a car or sofa or food to protect it from dust, rain, insects, etc. when not being used.
adj
1
Of or pertaining to the front cover of a book or magazine.
2
Of, pertaining to, or consisting of cover versions.
verb
1
To place something over or upon, as to conceal or protect.
He covered the baby with a blanket.
When the pot comes to a boil, cover it and reduce the heat to medium.
2
To be over or upon, as to conceal or protect.
The blanket covered the baby.
A great bargain also had been the excellent Axminster carpet which covered the floor; as, again, the arm-chair in which Bunting now sat forward, staring into the dull, small fire.
3
To be upon all of, so as to completely conceal.
Regular hexagons can cover the plane.
4
To set upon all of, so as to completely conceal.
You can cover the plane with regular hexagons.
5
To put on one's hat.
All the while he held his hat in his hand; and even until he had given his answer, when he covered and bade us be.
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