وقتل
And killing.
The noun “qatl” fundamentally denotes killing. When the expression is borrowed to portray a different act as exceptionally severe, the intensity associated with killing becomes the basis of the metaphor.
The critical point is that the borrowed expression is the action-noun or verbal noun itself, not a finite verb formed from it. Under the generic-noun analysis, a metaphor in the action-noun is original. It does not assert that every severe blow literally causes death.