The Collaborative International Dictionary of English v.0.48:

Crease \Crease\, v. t. [imp. & p. p. Creased (kr?st); p. pr. &
   vb. n. Creasing.]
   To make a crease or mark in, as by folding or doubling.
   [1913 Webster]

         Creased, like dog's ears in a folio.     --Gray.
   [1913 Webster]