go ahead vs hang up

go ahead

verb
  • To proceed with; to begin. 

  • Used to grant permission for or to give endorsement of a suggestion or proposal. 

  • To send communication over the radio. 

hang up

verb
  • To put up to hang. 

  • To terminate a telephone call. 

  • To keep delayed, suspended, held up, or stuck. 

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