loosen vs restrain

loosen

verb
  • To free from restraint; to set at liberty. 

  • To make loose. 

  • To become unfastened or undone. 

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

  • To become loose. 

  • To disengage (a device that restrains). 

restrain

verb
  • To deprive of liberty. 

  • To control or keep in check. 

  • To strain again. 

  • To restrict or limit. 

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