spank vs thresh

spank

verb
  • To beat, smack or slap a person's buttocks, with the bare hand or other object, as punishment, gesture, or form of sexual interaction. 

  • To move rapidly. 

  • To hit very hard. 

  • To soundly defeat, to trounce. 

noun
  • A slapping sound, as produced by spanking. 

  • An instance of spanking, separately or part of a multiple blows-beating; a smack, swat, or slap. 

thresh

verb
  • To violently toss the limbs about. 

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

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

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