fess vs say uncle

fess

verb
  • To confess; to admit. 

noun
  • A horizontal band across the middle of the shield. 

adj
  • Of animals, bad-tempered, fierce. 

  • Lively; active; strong. 

  • Proud; conceited. 

say uncle

verb
  • To admit defeat; indicate submission, such as when wrestling; to ask for mercy. 

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