fork over vs welsh

fork over

verb
  • To turn over (soil, hay, etc.) with a gardening fork. 

  • To pay (implies lots of money). 

welsh

verb
  • To cheat or swindle someone, often by not paying a debt, especially a gambling debt. 

  • To go back on one's word. 

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