freshen vs hum

freshen

verb
  • To remove or cover unpleasant qualities such as staleness, bad odour or taste (in air, breath, water, etc.). 

  • To top up (a drink). 

  • To touch up (makeup); to give (a body part, especially the face) a quick wash. 

  • To make less salty; to separate, as water, from saline ingredients. 

  • To make cool. 

  • To be refreshed. 

  • To touch up the paint on (something). 

  • To become not salty, to lose its salinity. 

  • To become cool. 

  • To refresh; to revive; to renew. 

  • To make green (vegetation that has become dry). 

  • To top up (primer) in a firearm. 

  • To give redness to (the face or cheeks of a person with light skin). 

  • To begin or resume giving milk, especially after calving; to cause to resume giving milk. 

  • To relieve, as a rope, by change of place where friction wears it; or to renew, as the material used to prevent chafing. 

  • To become stronger. 

hum

verb
  • To reek, smell bad. 

  • To produce low sounds which blend continuously 

  • To express by humming. 

  • To make a sound from the vocal chords without pronouncing any real words, with one's lips closed. 

  • To drone like certain insects naturally do in motion, or sounding similarly 

  • To buzz, be busily active like a beehive 

noun
  • Unpleasant odour. 

  • A phenomenon, or collection of phenomena, involving widespread reports of a persistent and invasive low-frequency humming, rumbling, or droning noise not audible to all people. 

  • Busy activity, like the buzz of a beehive. 

  • A hummed tune, i.e. created orally with lips closed. 

  • An often indistinct sound resembling human humming. 

intj
  • Synonym of um: a noise indicating doubt, uncertainty, &c. 

  • Synonym of hmm: a noise indicating thought, consideration, &c. 

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