Definitions
There are 2 meanings of the phrase
Firing Line.
Firing Line - as a noun
The line from which soldiers deliver fire
The most advanced and responsible group in an activity
Example: "The firing line is where the action is"
Example Sentences
"The soldiers took their positions on the firing line."
"The protesters stood bravely on the firing line, ready to face the consequences."
"The new recruits were nervous as they approached the firing line for the first time."
"The commander barked orders to his troops on the firing line."
"The bullets whizzed past the soldiers on the firing line."