plait vs straighten

plait

noun
  • A flat fold; a doubling, as of cloth; a pleat. 

  • A braid, as of hair or straw; a plat. 

verb
  • To fold; to double in narrow folds; to pleat 

  • To interweave the strands or locks of; to braid 

straighten

verb
  • To clarify a situation or concept to (an audience). 

  • To bribe or corrupt. 

  • To stand up, especially from a sitting position. 

  • To cause to become straight. 

  • To become straight. 

  • To put in order; to sort; to tidy up. 

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