go-ahead vs thumbs down

go-ahead

adj
  • Progressive; exerting leadership. 

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

  • Dashing; energetic. 

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

thumbs down

noun
  • A rejection or refusal. 

  • A gesture signifying disapproval; a thumb pointing down out of a fist. 

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