Reticule bloom
From Destinypedia, the Destiny wiki
Bloom, or reticle bloom, is a mechanic in video-games. This is when the reticle on the hud becomes larger with sustained fire, making the weapon less accurate. The reticle will return to normal after a sufficient time has passed without firing.
This mechanic is found in most first person shooters, such as Battlefield, Halo, and Call of Duty.
