I am not sure if it has any other non-literal meaning. Literally , its opposite is " unroll a carpet"

You could unfold a carpet as well.

The standard opposites are "to roll out" a carpet and "to roll up" a carpet. When you purchase a carpet, it most often comes in the shape of a cylinder. You then "roll out" the carpet, which means you extend the carpet so that it lies flat on the floor. Here's are rolled out carpets: http://www.shutterstock.com/pic-429720046/stock-photo-carpet-rug-antique-carpet-fragment-persian-carpet-with-ornaments-old-rugs-background.html?src=5KH3yPsP7H_KyrqZNwBRsw-1-44 When you wish to remove a carpet, you "roll up" the carpet, which means that you arrange the carpet in a cylinder shape. Here are some rolled up carpets: http://www.shutterstock.com/pic-222429697/stock-photo-carpets.html?src=7C9inN0IM8KY5Lg23qC1eg-1-7

You could unfold a carpet as well.