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