clear one's throat vs hem

clear one's throat

verb
  • Forcibly, sometimes mutedly, expelling air from one's lungs, sometimes to clear mucus, sometimes to attract attention to something; less vigorous than coughing. 

hem

verb
  • To make the sound expressed by the word hem; to hesitate in speaking. 

  • To shut in, enclose, confine; to surround something or someone in a confining way. 

  • To make a hem. 

  • To put hem on an article of clothing, to edge or put a border on something. 

intj
  • Used to fill in the gap of a pause with a vocalized sound. 

noun
  • In sheet metal design, a rim or edge folded back on itself to create a smooth edge and to increase strength or rigidity. 

  • A rim or margin of something. 

  • An utterance or sound of the voice like "hem", often indicative of hesitation or doubt, sometimes used to call attention. 

  • The border of an article of clothing doubled back and stitched together to finish the edge and prevent it from fraying. 

How often have the words clear one's throat and hem occurred in a corpus of books? (source: Google Ngram Viewer )