A razor, designed for safety, that protects the skin from all but the very edge of the blade (as opposed to a straight razor).
A knife, especially a makeshift one fashioned from something not normally used as a weapon (like a plastic spoon or a toothbrush).
A particular woody by-product of processing flax or hemp.
To stab someone with a shiv.
To stab someone with anything not normally used as a stabbing weapon.