Shiv

A shiv (from the Romani word chiv) is a slang term for any sharp or pointed implement used as a knife-like weapon, including knives themselves. However, the word in practical usage is frequently used when referring to an improvised bladed weapon. Shivs are commonly made by inmates in prisons across the world. A shiv can be anything from a glass shard with fabric wrapped around one end to form a handle, to a razorblade stuck in the end of a toothbrush. Some inmates have even sharpened the ends of pork chop bones to make them into weapons.

"Shiv" can also be used as a transitive verb, as in "to shiv [someone]", meaning "to cut or stab one with a shiv".