Top Definition
A device, or figure of speech, used with NPC* inaction (can be in real life and virtual) that is used to sway said NPC into giving unto one's way. Can be used in a threatening way, or friendly, mostly threating.

*Non Character Player (or not you)
Person 1:Today I had to use my Persuasion Knife to get my lazy brother to mow the lawn today

Person 2:"You pulled a knife on him?
Person 1:No, a rock. It works like a knife.
by SafetyPants April 07, 2011

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