-갔-

See the main entry. The vowel change to ㅏ (a) is irregular; Ko Gwang-mo believes it was potentially influenced by a putative suffix *갓 (-*gat-), which would have been the yang-vowel form of the etymologically unrelated Early Modern suffix 것 (-geot-).[1]

갔 • (-gat-)

1. Northern and western Gyeonggi and western Gangwon form of 겠 (-get-, “will, intend, probably”).
   • 2009 February 19, 민영철, “도읍이 되지 못한 봉성산”, in 한국구비문학대계‎, 경기도 김포시 하성면:

     그 뜻이 그건 저두 잘 모르갔어요

     geu tteut-i geugeon jeo-du jal moreugasseoyo

     The meaning of that, even I would not know.

   • 2011 March 5, 배경성, “궁예의 패망과 울음산의 유래”, in 한국구비문학대계‎, 강원도 철원군 철원읍:

     말 타구 도망가갔구 그 산정호수 뒤에...

     Mal tagu domanggagatgu geu sanjeonghosu dwi-e...

     Gung Ye intended to flee by riding a horse behind Sanjeong Lake...

• Sometimes the synonymous suffix 갓 (-gat-), the form used in Hwanghae, Pyong'an, and Yukjin, is also written as 갔 (-gat-) under influence from the standard orthography.