clear out vs unlade

clear out

verb
  • to completely empty 

  • to become empty 

  • to remove or eject (from), especially forcibly 

  • To rob or steal from (someone). 

  • To be victorious in gambling against (someone). 

  • to leave quickly 

unlade

verb
  • To unload. 

  • To discharge a cargo; discharge a burden. 

  • To disburden; take the burden from; relieve. 

  • To discharge the cargo from. 

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