be certain vs swither

be certain

swither

verb
  • To move or swing about. 

  • To be indecisive or in a state of confusion; to dither. 

noun
  • A state of indecision or confusion; a panicked state; a flap, fluster, or dither. 

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