Shred, RIVE, and DROP are all terms used to describe the action of cutting or tearing something irregularly. Shredding is the process of cutting something into thin strips, usually with a machine. Riving is the process of splitting something into two or more pieces with a tool such as an axe or chisel. Dropping is the process of tearing something apart by hand. All three of these terms can be used to describe the action of cutting or tearing something irregularly.