1.verbTo straighten something that has been rolled, twisted or curled.
"Unroll your sleeping bag and spread it on the floor of the tent."
2.verbTo emerge, be revealed or become apparent; to unfold.
"We will have to see how the events unroll."
3.verbTo replace (a loop in a program) with a repetitive sequence of the individual instructions that the loop would carry out, sometimes used as an optimization.
4.nounThe process by which something is unrolled.
5.nounA pseudoscientific entertainment spectacle at which a mummy was unwrapped.