call an audible
To change the play at the line of scrimmage by yelling out a new one.
adj
Able to be heard.
"Now, look here, Jim Hawkins," he said, in a steady whisper, that was no more than audible […]
verb
To change the play at the line of scrimmage by yelling out a new one.
The quarterback audibled after seeing the defensive formation.
noun
The act of or an instance of changing the play at the line of scrimmage by yelling out a new one.
The audible changed the play to a run.