let-down vs sorry

let-down

noun
  • A disappointment or anticlimax. 

  • The clearance of an aircraft to descend through clouds to clear air below, or the process of granting such a clearance. 

  • The neurohormonal release of milk in dairy cows or in breastfeeding human mothers. 

sorry

noun
  • The act of saying sorry; an apology. 

intj
  • Expresses regret, remorse, or sorrow. 

  • Used as a request for someone to repeat something not heard or understood clearly. 

  • Said as a request to pass somebody. 

  • Used to correct oneself in speech. 

adj
  • Grieved or saddened, especially by the loss of something or someone. 

  • Pathetic; contemptibly inadequate. 

  • Poor, pitifully sad or regrettable. 

  • Regretful or apologetic for one's actions. 

How often have the words let-down and sorry occurred in a corpus of books? (source: Google Ngram Viewer )