وَفَلَلْتَ شَبَاةَ اعْتِدَائِكَ
And why have you not blunted the sharp edge of your aggression?
Falla refers to chipping or dulling an edge. Shabāh is the keen edge or point of a weapon; iʿtidāʾ is overstepping the bounds and causing harm.
Wrongdoing is pictured as a sharp blade that needs to lose its cutting force. The instruction is figurative: reduce harmful conduct, not literally repair a sword.