-올시다

From 오 (-o-, humble suffix) + Early Modern Korean 로쇠다 (-lwoswoyta). The final part is ultimately from Middle Korean 로〮소〮ᅌᅵ다〮 (-lwóswóngìtá), a combination of Middle Korean suffixes 롯〮 (-lwós-, emotive suffix) +‎ ᄋᆞ〮ᅌᅵ (-óngì-, politeness suffix) +‎ 다〮 (tá, declarative suffix).

A more polite version of ㄹ세 (-lse). Compare the pairs 읍시다 (-eupsida) - 세 (-se), 습니다 (-seumnida) - 네 (-ne).

• (SK Standard/Seoul) IPA^(key): [o̞ɭɕ͈ida̠]
• Phonetic hangul: [올씨다]

올시다 • (-olsida)

1. Used with 이다 (-ida) and 아니다 (anida) to make declarations. A politer version of ㄹ세 (-lse) and 로다 (-roda).
   • 싸이 (PSY) [ssai (PSY)] (lyrics and music) (2017) “New Face”, in PSY 8th 4X2=8‎ (in Korean): “원래 이런 사람이냐고 / 아니올시다 ― wollae ireon saraminyago / aniolsida ― You asking if I'm like this normally? / No”