debellate
To conquer (someone) in war; to subdue.
obsolete, transitive
They [the French] deſire (king Edward [III] grovvne aged) not to ſeeme by ſitting ſtill vpon ſo many thornes of diſgrace, and loſſe, to haue beene outvvarred, though ouer-vvarred, and though in tvvo or three battels inferior, yet not to haue beene clearly debellated.
Where it comes from
First attested in 1611; borrowed from Latin dēbellātus, perfect passive participle of dēbellō (“to subdue”), see -ate (verb-forming suffix). Doublet of debel.
Adapted from the Wiktionary entry debellate (CC BY-SA 4.0).