clear up vs fluster

clear up

verb
  • To depart or disappear. 

  • To clarify, to correct a misconception. 

  • To clean up. 

  • To become free of certain blemishes. 

  • Of stormy weather, to dissipate, to become calm. 

  • To pot all of the remaining balls in a single turn. 

fluster

verb
  • To confuse; befuddle; throw into panic by making overwrought with confusion. 

  • To be in a heat or bustle; to be agitated and confused. 

noun
  • A state of being flustered; overwrought confusion. 

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