1 an extra item that is added to sth and is useful or attractive but not of great importance 附件；配件: The car has accessories such as an electronic alarm. 这辆车子装有电子警钟之类的附加设备。

2 [usu.pl] a thing that you wear or carry that matches your clothes, for example a piece of jewellery, a bag, etc 服装的配件或装饰物（例如珠宝、提包等）

3 an accessory (to sth) (in law) a person who helps sb to do sth illegal （法律）从犯；帮凶: He was charged with being an accessory to murder. 他被指控为谋杀案的从犯。