loosen vs screw up

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). 

screw up

verb
  • To make a mess of; to ruin. 

  • To twist into a contorted state. 

  • To blunder; to make a mistake. 

  • To raise or summon up. 

  • To tighten or secure with screws. 

  • To raise (rent, fees, etc.) to extortionate levels. 

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