Here the idea of rising up represents rebelling. Alternate translation: "many people will rebel against the king" (See: [[rc://en/ta/man/jit/figs-metaphor]])
Possible meanings are 1) this speaks of the literal children of that society's violent people, who are themselves violent, or 2) this is a metaphor for "Those among your people who are violent." (See: [[rc://en/ta/man/jit/figs-metaphor]])