attach vs untie

attach

verb
  • To adhere; to be attached. 

  • To connect, in a figurative sense; to ascribe or attribute; to affix; with to. 

  • To win the heart of; to connect by ties of love or self-interest; to attract; to fasten or bind by moral influence; with to. 

  • To come into legal operation in connection with anything; to vest. 

  • To fasten, to join to (literally and figuratively). 

untie

verb
  • To become untied or loosed. 

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

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

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