1. 代表；代替
If you do something by proxy, you arrange for someone else to do it for you.

2. 代理人；代替者；替代物
A proxy is a person or thing that is acting or being used in the place of someone or something else.

1. a power of attorney document given by shareholders of a corporation authorizing a specific vote on their behalf at a corporate meeting

2. a person authorized to act for another

Synonym: placeholderprocurator