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

1.
memenuhi, mengisi dengan bersepah
to fill a space or area with too many things, making it untidy
:
•
Please don't clutter up the table with your books.
Tolong jangan penuhkan meja dengan buku-buku anda.
•
The old furniture was cluttering up the attic.
Perabot lama memenuhi loteng.