Source : Webster's Revised Unabridged Dictionary (1913)

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.