overstrain vs sicken

overstrain

verb
  • To subject to an excessive demand on strength, resources, abilities, or the imagination. 

noun
  • excessive strain 

sicken

verb
  • To be filled with disgust or abhorrence. 

  • To fill with disgust or abhorrence. 

  • To become ill. 

  • To lower the standing of. 

  • To make ill. 

  • To become disgusting or tedious. 

  • To become weak; to decay; to languish. 

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