[Ultimately from Old Norse hrukka, wrinkle, fold;
Use: The Professor was waiting in his patient's room, sitting on the side of the carefully made bed, rucking up the quilt in a careless fashion. (Winter Wedding)
Hospitals don't make such a fuss anymore if anyone rucks up the bed linen. During my post-natal stays, the only way I could get comfortable was if I made a bit of a nest--shoring up the sides of the bed with those paper-thin pillows and soft as down (ha!) hospital blankets. Me and baby would spend a lot of time falling in love with each other in the hollowed out mess. Lots of rucking going on. Lots.