let fly

verb2

1. •
   To strike or release a projectile with great force.

   • Norwich were back on level terms through an equally stunning finish by Morison in the 53rd minute, the former Millwall player letting fly from the edge of the area after being teed-up by Leon Barnett. — 2011
2. •
   (figurative) To unleash an angry outburst.

   • She was furious and let fly at him with a string of obscenities.