A shiv is a homemade knife or blade, often made and used by prisoners.
The word shiv can make people think of danger, violence, and illegal activities.
Examples:
The prisoner had a shiv hidden in his sock.
He made a shiv out of a piece of metal.
The shiv was found during a search of the cell.
I hope no one tries to use a shiv on me!
In the movie, the bad guy had a shiv.
He was caught with a shiv in his pocket.