double-cross vs fleece

double-cross

verb
  • To betray or go back on. 

  • To cross twice in hybridization, as (A × B) × (C × D); for example, in commercial hybrid seed corn, A through D are classically inbreds, and their grandoffspring is the seed for sale. 

fleece

verb
  • To con or trick (someone) out of money. 

  • To cover with, or as if with, wool. 

  • To shear the fleece from (a sheep or other animal). 

noun
  • A textile similar to velvet, but with a longer pile that gives it a softness and a higher sheen. 

  • Any soft woolly covering resembling a fleece. 

  • The fine web of cotton or wool removed by the doffing knife from the cylinder of a carding machine. 

  • Mat or felts composed of fibers, sometimes used as a membrane backer. 

  • An insulating wooly jacket 

  • Hair or wool of a sheep or similar animal 

  • Insulating skin with the wool attached 

How often have the words double-cross and fleece occurred in a corpus of books? (source: Google Ngram Viewer )