a tool or machine that is used for cutting things into very small pieces

a paper/document/vegetable shredder 碎纸机／文件粉碎机／蔬菜切丝机

Much of the documentary evidence against her had been put through the shredder before she was arrested. 她被捕前，许多对她不利的书面证据都被放进了碎纸机。