clutter up

US /ˈklʌt.ər ʌp/
UK /ˈklʌt.ər ʌp/
"clutter up" picture
1.

散らかす, ごちゃごちゃにする

to fill a space or area with too many things, making it untidy

:
Please don't clutter up the table with your books.
テーブルを本で散らかさないでください。
The old furniture was cluttering up the attic.
古い家具が屋根裏を散らかしていた