Etymology

First attested in the Yongbi eocheonga (龍飛御天歌 / 용비어천가), 1447, as ᄉᆞᅀᅵ (Yale: sozi). Derived from root ᄉᆞᆺ (sos, “space between”) + —이 (-i).

Pronunciation

• IPA^(key): /sʰa̠i/
• Phonetic hangeul: 사이