firing_line
1. [ noun ] (military) the line from which soldiers deliver fire
Related terms: line
2. [ noun ] (sociology) the most advanced and responsible group in an activity
Examples:

"the firing line is where the action is"

Related terms: class
Similar spelling:   firing_pin
  firing_range
  firing_off
  firing_chamber
  Fringillidae
  firing_squad
  firing_party
  fieriness
  fringe_benefit