The Collaborative International Dictionary of English v.0.48:

Ruck \Ruck\, v. t. & i. [imp. & p. p. Rucked; p. pr. & vb. n.
   Rucking.] [Icel hrukkast to wrinkle, hrukka wrinkle, fold.]
   To draw into wrinkles or unsightly folds; to crease; as, to
   ruck up a carpet. --Smart.
   [1913 Webster]