났대

apparently happened, they say ... broke out

→ 나다
났 Past tense + 대 Reported speech (hearsay)
verb · informal, past tense Rare #31,340
apparently happened, they say ... broke out Informal; reports something the speaker heard.
KO: 밖에 불이 났대.
EN: I heard a fire broke out outside.
Conjugation of 나다

야, 야, 싸움 났대 싸움 났대, 보러 가자…

Hey, hey, I heard there’s a fight! There’s a fight! Let’s go watch…

— 20th Century Girl (2022)

애는 왜 열이 났대?

What did they say caused the child's fever?

— 어느 가족 (2018)