lock up vs untie

lock up

verb
  • To stop moving; to seize. 

  • To invest in something long term. 

  • To close all doors and windows (of a place) securely. 

  • To (mistakenly) cause or have one of one's wheels to lock up (stop spinning). 

  • To lose one's forward momentum; to freeze. 

  • To imprison or incarcerate (someone). 

  • To cause (a program) to cease responding or to freeze. 

  • To stop spinning due to excessive braking torque. 

  • To travel through a flight of locks on a waterway in an uphill direction. 

  • To cease responding; to freeze. 

untie

verb
  • To free from fastening or from restraint; to let loose; to unbind. 

  • In the Perl programming language, to undo the process of tying, so that a variable uses default instead of custom functionality. 

  • To resolve; to unfold; to clear. 

  • To become untied or loosed. 

  • To loosen, as something interlaced or knotted; to disengage the parts of. 

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