leeching

In pre-scientific medicine, leeching was an alternative form of blood letting in which "bad" blood would be removed via leeches instead of by bleeding.
Leeching may also refer to the practice of benefitting from others' actions without contributing in kind. For example:

In peer-to-peer file sharing networks, leeching is downloading files without sharing any.
More generally, it is used as a term for certain types of bandwidth theft.
In online computer games (especially role-playing games), leeching refers to the practice of a player joining a group for the explicit purpose of gaining rewards without contributing anything to the efforts necessary to acquire those rewards. Sometimes this is allowed in an effort to powerlevel a player. Usually it is considered poor behavior to do this without permission from the group.

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