calve vs loosen

calve

verb
  • to break off 

  • to shed (a large piece, e.g. an iceberg); to set loose (a mass of ice), e.g. a block of ice (coming off an iceberg) 

  • to give birth to (a calf) 

  • to assist in a cow's giving birth to a calf 

  • to shed a large piece, e.g. an iceberg or a smaller block of ice (coming off an iceberg) 

  • to give birth to a calf 

loosen

verb
  • 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. 

  • To disengage (a device that restrains). 

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