出典:Wiktionary
sepelliō (present infinitive sepellīre, perfect active sepellīvī, supine sepultum または sepellītum); fourth conjugation
Early on there appears to have arisen a variant *sepulliō by analogy with the participle sepultus. Some of the Romance forms may have adapted to reflexes of the prefix sub-. There seems to have been an early gemination of the /p/ in Italy, though this was not universal.