clutter up
US /ˈklʌt.ər ʌp/
UK /ˈklʌt.ər ʌp/

1.
abarrotar, desordenar
to fill a space or area with too many things, making it untidy
:
•
Please don't clutter up the table with your books.
Por favor, no abarrotes la mesa con tus libros.
•
The old furniture was cluttering up the attic.
Los muebles viejos estaban abarrotando el ático.