a combination of a wrench and a knife, to utilize both cutting and tightining, losining in a single tool.
In the TV sitcom "Scrubs" the janitor makes his own knifewrench and flaunts it infront of several of the other characters in the show.
The best invention ever created. Coined by the Janitor in Scrubs.
"Knifewrench! For Kids!"
"Knifewrennnnnnnnnnch! Practical AND safe!"