thwart vs unwind

thwart

noun
  • An act of thwarting; something which thwarts; a hindrance, an obstacle. 

  • A seat across a boat on which a rower may sit. 

  • A brace, perpendicular to the keel, that helps maintain the beam (“breadth”) of a marine vessel against external water pressure and that may serve to support the rail. 

adj
  • Placed or situated across something else; cross, oblique, transverse. 

verb
  • To cause to fail; to frustrate, to prevent. 

unwind

noun
  • Any mechanism or operation that unwinds something. 

verb
  • To undo something. 

  • To relax; to chill out; to rest and become relieved of stress 

  • To close out a position, especially a complicated position. 

  • To be or become unwound; to be capable of being unwound or untwisted. 

  • To analyse (a call stack) so as to generate a stack trace etc. 

  • To separate (something that is wound up) 

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