depreciation vs low tide

depreciation

noun
  • The measurement of the decline in value of assets. Not to be confused with impairment, which is the measurement of the unplanned, extraordinary decline in value of assets. 

  • The decline in value of assets. 

  • The state of being depreciated; disparagement. 

low tide

noun
  • The time of day when the sea has receded to its lowest level. 

  • The tide at its lowest level for a particular tidal cycle at a certain place. 

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