debond vs loosen

debond

verb
  • To remove a bonding agent such as glue, or to free from such a bonding 

  • To lift a posted bond 

loosen

verb
  • To disengage (a device that restrains). 

  • To make loose. 

  • To free from restraint; to set at liberty. 

  • To become unfastened or undone. 

  • To relieve (the bowels) from constipation; to promote defecation. 

  • To become loose. 

How often have the words debond and loosen occurred in a corpus of books? (source: Google Ngram Viewer )