Appears to contain the causative suffix -구- (-gu-).
알구다 • (alguda) (infinitive 알구어 or 알궈, sequential 알구니)
- Gangwon, Pyongan, and Hamgyong form of 알리다 (allida, “to announce, inform”)
2010 January 22, 한방자 [hanbangja], “물통방아를 혼자서 옮긴 아기장수 [multongbang'areul honjaseo omgin agijangsu]”, in 한국구비문학대계 [han'gukgubimunhakdaegye][1], 강원도 고성군 현내면 [gang'wondo goseonggun hyeonnaemyeon]:그래서 옛날에는 그걸 보고 안 알구면은 삼대가 망한다는구만- geurae-seo yennar-e-neun geugeol bo-go an algu-myeon-eun samdae-ga manghanda-neun-guman
- So if you didn't announce [the baby] then three generations of the family would suffer.