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

1.
memenuhi, mengisi dengan berantakan
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 memenuhi meja dengan buku-bukumu.
•
The old furniture was cluttering up the attic.
Perabotan lama memenuhi loteng.