skedaddle vs slope off

skedaddle

verb
  • To move or run away quickly. 

  • To spill; to scatter. 

noun
  • The act of running away; a scurrying off. 

slope off

verb
  • To depart quietly, without being noticed. 

How often have the words skedaddle and slope off occurred in a corpus of books? (source: Google Ngram Viewer )