prate vs talk the hind leg off a donkey

prate

verb
  • To talk much and to little purpose; to be loquacious; to speak foolishly. 

noun
  • Talk to little purpose; trifling talk; unmeaningful loquacity. 

talk the hind leg off a donkey

verb
  • To talk a lot. 

How often have the words prate and talk the hind leg off a donkey occurred in a corpus of books? (source: Google Ngram Viewer )