ったそうだ
narikitta sōda

Godan Verb (ru)
Evidential Auxiliary

Expresses hearsay about a past event ("I heard that...") of 成り切る

1. It is said that they became (someone/something).; They apparently fully became (someone/something).; They are said to have fully immersed themselves (in a role/situation).

Past/Perfective
Hearsay Evidence