decline vs get down

decline

verb
  • To bend downward; to bring down; to depress; to cause to bend, or fall. 

  • To choose not to do something; refuse, forbear, refrain. 

  • To run through from first to last; to recite in order as though declining a noun. 

  • To cause to decrease or diminish. 

  • To turn or bend aside; to deviate; to stray; to withdraw. 

  • To move downwards, to fall, to drop. 

  • To inflect for case, number, gender, and the like. 

  • To reject a penalty against the opposing team, usually because the result of accepting it would benefit the non-penalized team less than the preceding play. 

  • To become weaker or worse. 

  • To recite all the different declined forms of (a word). 

noun
  • A weakening. 

  • Downward movement, fall. 

  • A reduction or diminution of activity. 

  • The act of declining or refusing something. 

  • A sloping downward, e.g. of a hill or road. 

get down

verb
  • To bring or come down; to descend; to cause to bring or come down. 

  • Used other than figuratively or idiomatically: see get, down. 

  • To party. 

  • To duck or take cover, usually to avoid harm. Commonly used as a caution or warning in the imperative. 

  • To concentrate; attend. 

  • To swallow (something). 

  • To leave the table after dining. 

  • To relax and enjoy oneself completely; be uninhibited in one's enjoyment. 

  • To have sex. 

  • To record in writing. 

  • To depress; discourage; fatigue. 

  • To dance, particularly without inhibition or restraint, or in a sexually suggestive manner. 

  • To criticise 

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