ほろぼしたそうだ
uchihoroboshita sōda

Godan Verb (su)
Evidential Auxiliary

Expresses hearsay about a past event ("I heard that...") of 討ち滅ぼす

1. It is said they destroyed.; They reportedly annihilated.; It's rumored they wiped out.

Past/Perfective
Hearsay Evidence