A case is something you use to keep things safe or tidy. It can be a box or cover for small items.
I have a case for my phone.
Put the glasses in the case.
Case in grammar means how a noun or pronoun changes to show its role in a sentence. Some languages have many cases.
In Latin, words change by case.
The noun is in the accusative case.
A case can be a large box or pack that has many similar items inside, like bottles or cans sold together.
I bought a case of water bottles.
He ordered a case of soda today.
As a verb, to case means to look at a place carefully, often before doing something secret or illegal.
They cased the building at night.
He cased the house before the theft.
