The kids always clutter the hall (up) with school bags and coats and stuff. 孩子们总是在厅里乱放书包、外套和乱七八糟的东西。
Every shelf is cluttered with ornaments. 每层架子上都塞满了装饰品。
figurative I try not to clutter (up) my mind with useless information. 我尽量不往脑子里装那些无用的东西。
Opposite: clear