[] () an extra piece of information (clause) that is added to a contract or an official document附文；公文的附加材料；附加条款 () extra information that is added to an insurance agreement in order to include extra items that are not mentioned in the standard agreement; a form used to add this information保险附加条款；附加险（表格）◆You can add a rider to a home insurance policy to cover computer equipment.你可以在房屋险保单里增加投保计算机设备的附加险。dispatch rider free rider