go ahead with vs hold off

go ahead with

verb
  • To resume something previously cancelled or delayed; to continue something despite known concerns. 

hold off

verb
  • To delay someone or something temporarily; to keep at bay. 

  • To delay commencing (an action until some specified time or event has passed). 

How often have the words go ahead with and hold off occurred in a corpus of books? (source: Google Ngram Viewer )