shiv

Etymology

First attested 1915. From chive, chieve, chife, chiv (“knife”), from Romani chive, chiv, chivvomengro (“knife, dagger, blade”).

noun

1. A knife, especially a makeshift one fashioned from something not normally used as a weapon (like a plastic spoon or a toothbrush).
   It's perhaps fitting that I write this introduction in jail—that graduate school of survival. Here you learn how to use toothpaste as glue, fashion a shiv out of a spoon and build intricate communication networks. 1971, Abbie Hoffman, “Introduction”, in Steal This Book, Pirate Editions / Grove Press
2. A particular woody by-product of processing flax or hemp.

verb

1. To stab someone with a shiv.
2. (by extension) To stab someone with anything not normally used as a stabbing weapon.