agitate vs churn

agitate

verb
  • To cause to move with a violent, irregular action; to shake. 

  • To disturb or excite; to perturb or stir up (a person). 

churn

verb
  • To move rapidly and repetitively with a rocking motion; to tumble, mix or shake. 

  • To produce excessive and sometimes undesirable or unproductive activity or motion. 

  • To continually sign up for new credit cards in order to earn signup bonuses, airline miles, and other benefits. 

  • To agitate rapidly and repetitively, or to stir with a rowing or rocking motion; generally applies to liquids, notably cream. 

  • To stop using a company's product or service. 

  • To repeatedly cancel and rebook a reservation in order to refresh ticket time limits or other fare rule restrictions. 

  • To carry out wash sales in order to make the market appear more active than it really is. 

noun
  • A milk churn. 

  • The mass of people who are ready to switch carriers. 

  • Cyclic activity that achieves nothing. 

  • A vessel used for churning, especially for producing butter. 

  • The time when a consumer switches his/her service provider. 

  • Customer attrition; the phenomenon or rate of customers leaving a company. 

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