go-ahead vs pushing

go-ahead

adj
  • Dashing; energetic. 

  • Progressive; exerting leadership. 

  • Being a score which gives the scoring team or player the lead in the game. 

noun
  • Approval, agreement, or instruction to begin or proceed. 

pushing

adj
  • That pushes forward; pressing, driving. 

noun
  • The act by which something is pushed. 

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