audible vs well-marked

audible

verb

  • To change the play at the line of scrimmage by yelling out a new one. 

adj

  • Able to be heard. 

noun

  • The act of or an instance of changing the play at the line of scrimmage by yelling out a new one. 

well-marked

How often have the words audible and well-marked occurred in a corpus of books? (source: Google Ngram Viewer )