To 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
If you unroll something such as a sheet of paper or cloth, or if it unrolls, it opens up and becomes flat when it was previously rolled in a cylindrical shape. I unrolled my sleeping bag as usual Guests bring movies on tape, and show them on the screen that unrolls from the ceiling. to open something that was in the shape of a ball or tube, and make it flat, or to become open in this way