To scrunch is to crumple or crush something. In the process of writing your novel by hand, you'll have to scrunch a lot of pages and toss them into the trash can.
You can scrunch up you sister's favorite shirt and shove it back in her drawer after she says you can't borrow it, and you can also scrunch up your face in anger. Use this verb whenever you crease, wrinkle, crush, or squeeze something into a mass. It's also a good term for a crunching sound: "I heard a scrunch in the dry leaves under my window." Scrunch arose as an intensive form of crunch, originally meaning "to bite."