strangle vs tamp down

strangle

verb
  • To stifle or suppress. 

  • To kill someone by squeezing the throat so as to cut off the oxygen supply; to choke, suffocate or throttle. 

  • To be stifled, choked, or suffocated in any manner. 

  • To be killed by strangulation, or become strangled. 

noun
  • A trading strategy using options, constructed through taking equal positions in a put and a call with different strike prices, such that there is a payoff if the underlying asset's value moves beyond the range of the two strike prices. 

tamp down

verb
  • To suppress (something, usually an emotion or thought). 

  • To compact a substance (usually soil) until it is flat. 

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