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1.
Character Assassination is the act of attempting to influence the portrayal or reputation of a particular person, causing others to develop an extremely negative perception of him/her. By its nature, it involves deliberate exaggeration or manipulation of facts to present an untrue picture of the targeted person.

Basically, it is spreading rumours and talking bad about somebody, to make people hate them.
1. I'm just another victim of Character Assassination.

2. The media and politicians are Character Assassins.
by MichaelToTheJ May 14, 2007