iron bomb noun a conventional aerial bomb that is simply dropped from the sky without any targeting capability in the bomb US,1962
— Gareth Perry, TheGuardian, 2 July 1982
The bombs that Bush knew firsthand over 40 years ago are what the military calls “iron” or “dumb” bombs, those used since World War 1 to terrify the enemy from the air by opening bomb bay doors and letting them loose. — TheHoustonChronicle, 19 January 1991