tamp down vs walk over

tamp down

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

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

walk over

verb
  • To dominate, treat (someone) as inferior. 

  • Used other than figuratively or idiomatically: to walk over. 

  • To gain an easy victory. 

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