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

1.
ingombrare, riempire di disordine
to fill a space or area with too many things, making it untidy
:
•
Please don't clutter up the table with your books.
Per favore, non ingombrare il tavolo con i tuoi libri.
•
The old furniture was cluttering up the attic.
I vecchi mobili stavano ingombrando la soffitta.