noun
the practice of living as a parasite in or on another organism
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Parasitism is a type of symbiotic relationship where one organism benefits at the expense of another.
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Some people view certain business practices as a form of parasitism, where one company profits off the work of others.
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That guy is a total parasite, always mooching off of his friends without giving anything in return.
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The toxic relationship between the manager and employees was described as a form of emotional parasitism, draining the morale of the entire team.