Kinktionary
More like guidelines and a lot less like definitions.
Knife Play
An activity where a knife is dragged over the body of a recipient. The intensity of this type of play is connected to fear play and it can result in cuts in clothing or on the surface of the skin.
Often a more dull blade is used so that the skin is not perforated but it still gives a scratching or cutting sensation. Sometimes people will use a two sided blade with one sharp and one dull side to manipulate a recipient to believe they are cut with a sharp knife when the sharp side was only actually used for demonstration.