ruck (something) up
phrasal verb with ruck verb uk/rʌk/ us/rʌk/
（使）变皱;（使）起皱;折叠
If material rucks up, it forms a lump (= mass) or folds, and if something rucks it up, it pushes the material into a lump or folds.
The blankets had rucked up around his feet. 地毯皱巴巴地在他的脚边拱了起来。