run its course vs scamper

run its course

verb
  • To come to a natural end. 

scamper

noun
  • A quick, light run. 

  • One who skimps or does slipshod work. 

verb
  • To run quickly and lightly, especially in a playful or undignified manner. 

How often have the words run its course and scamper occurred in a corpus of books? (source: Google Ngram Viewer )