cool one's heels vs slummock

cool one's heels

verb

  • To wait, especially impatiently or restlessly. 

slummock

verb

  • To behave lazily or indolently 

  • To behave awkwardly or clumsily 

noun

  • A slovenly person 

How often have the words cool one's heels and slummock occurred in a corpus of books? (source: Google Ngram Viewer )