By proxy

[PussyCat]

The ability to do or be something without actually physically doing it.

[Britney]

A Proxy is the authority to represent another person or entity... Especially in the capacity of voting issues, such as on a board of directors.
This authority can be granted willingly, (as in the case of someone who cannot attend a meeting sending another to vote in her place) or unwillingly (such as in the case of a parents authority over the affairs of a child. It can be granted with or without limitation (Go to the meeting and vote yes on the takeover, for all my shares. or The Executor is granted any and all reasonable powers necesary to manage and maintain the estate of Jonh, while he is in his coma.)
A parent, for instance, holds an automatic right of proxy in certain interests of her child. The child need not and cannot make decisions not granted her by her parent, because the parent has the legal authority to make those decisions for the child.
When something is done or decided by proxy, it means the actual effort of action, and sometimes the decision, was made by someone else.

[Rihanna]

implied action taken or status gained through association with or closeness to another (same origin as proximity)

[Tanya Shivari]

to get something second hand

[PussyCat]

legal definition similiar to power of attorney, e.g. alternative way that leads to a same purpose or conclusion.

[Donald Trump]

To have someone else wait in line for your lazy ass.

[Jason Yan]

As a result of.

[Little_Girl]

Proxy, can also mean using someone on your behalf.

[Luis Fok]

if someone used a medium, for example below the mug, and that person did something, the next person who uses that medium basically did that same thing.

[Sarah]

authority given to a person to act for someone else, such as by voting for them in an election, or the person who this authority is given to: