en_tn/2ch/21/04.md

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risen up over his father's kingdom

To "rise up over" something is an idiom that means to control it. AT: "taken complete control over his father's kingdom" (See: rc://en/ta/man/translate/figs-idiom)

he killed all his brothers with the sword

Jehoram probably did not kill them personally, but had other people do it for him. AT: "he caused all of his younger brothers to be killed" (See: rc://en/ta/man/translate/figs-metonymy)