blarney vs buttering up

blarney

noun
  • Ability to talk constantly and fluently. 

  • Mindless chatter. 

  • Persuasive flattery or kind speech; smooth, wheedling talk. 

verb
  • To beguile with flattery. 

buttering up

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