This is the 8555th most frequent Dutch word.
hoesje
A "hoesje" is a small cover or case.
Here, 'hoesje' refers to a protective covering for a mobile device such as a phone.
Ik heb een nieuw hoesje voor mijn telefoon gekocht.
I bought a new case for my phone.
In this context, 'hoesje' pertains to the outer protective cover of a book.
Het hoesje van dit boek is versleten door gebruik.
The cover of this book is worn out from use.
In this sentence, 'hoesje' is used to indicate a protective case designed for a CD.