proxy

Don't feel like going to the grocery store today? See if you can send your brother as a proxy, meaning he's a substitute authorized to act for you.

Now, don't get crazy about getting your brother to do everything for you. Running your errands is one thing, but if you're a historian and your brother is an accountant, he is not a good proxy for you when you don't feel like researching your book about Napoleon. And you wouldn't be a good proxy for him in his work. A proxy must be well-chosen to truly act on another person's behalf.

Definitions of proxy
  1. noun
    a person authorized to act for another
    synonyms: placeholder, procurator
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    type of:
    agent
    a representative who acts on behalf of other persons or organizations
  2. noun
    a power of attorney document given by shareholders of a corporation authorizing a specific vote on their behalf at a corporate meeting
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    type of:
    power of attorney
    a legal instrument authorizing someone to act as the grantor's agent
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