dack vs shamble

dack

verb
  • To pull down someone's trousers as a practical joke. 

shamble

verb
  • To walk while shuffling or dragging the feet. 

noun
  • One of a succession of niches or platforms, one above another, to hold ore which is thrown successively from platform to platform, and thus raised to a higher level. 

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