swingle vs thresh

swingle

verb
  • To beat or flog, especially for extracting the fibres from flax stalks; to scutch. 

  • To dangle; to wave hanging. 

noun
  • The swinging part of a flail, especially that which is used on the grain in threshing; the swiple. 

  • An implement used to separate the fibres of flax by beating them; a scutch. 

thresh

verb
  • To separate the grain from the straw or husks (chaff) by mechanical beating, with a flail or machinery. 

  • To beat soundly, usually with some tool such as a stick or whip; to drub. 

  • To violently toss the limbs about. 

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