From Wiktionary, the free dictionary
갈ㅇ (kàlG-, “to split”) + 아 (-a) + 디 (ti-, “to fall”)
- (Morphophonemic) IPA(key): ⫽kàlɣátiH!tá⫽
갈아〮디다〮 (kàlG-á-tì-tá) (infinitive 갈아〮디〮여〮, sequential 갈아〮디니〮)
- (intransitive) to split, to get divided
1447, 월인천강지곡 (Worin Cheongangjigok), volume 1, page 39a:ᄀᆞᄅᆞᆷ애 드르시니 믌결이 갈아디거늘 드틀에 소사나시니- kolom-ay tul-usi-ni mulskyel-i kalGati-kenul tuthul-ey swos-a-na-si-ni
- When [he] stepped into the river, the waves split apart, and [he] rose from the dust