talk big vs yap

talk big

verb
  • To brag; to exaggerate one's abilities or achievements. 

yap

verb
  • To talk, especially excessively; to chatter. 

  • Of a small dog, to bark. 

  • To rob or steal from (someone). 

noun
  • The high-pitched bark of a small dog, or similar. 

  • The mouth, which produces speech. 

  • Casual talk; chatter. 

  • A badly behaved child; a brat. 

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