kill someone vs play up

kill someone

play up

verb
  • To make or attempt to make something appear more important, likely, or obvious; to showcase or highlight. 

  • To play more vigorously. 

  • To be unfaithful to a lover; to cheat; used with on. 

  • To misbehave. 

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