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Making up lies about someone else when they're not around to fight back, just so you can feel superior and watch them get trampled.
My ex said I cheated on her with 3 people at once. I only cheated on her with 1 person, and he was ugly.
My neighbor told everyone my dog peed on the lawn. My dog is a good dog. My neighbor is a bad neighbor.
My coworker said I stole her lunch. I didn't steal it. I just took it.