Korean Etymology 더하 (deoha-) + 기 (-gi). Pronunciation (SK Standard/Seoul) IPA(key): [tʌ̹ɦa̠ɡi]Phonetic hangul: [더하기]More information Romanizations, Revised Romanization? ...RomanizationsRevised Romanization?deohagiRevised Romanization (translit.)?deohagiMcCune–Reischauer?tŏhagiYale Romanization?tehakiClose Noun 더하기 • (deohagi) addition plus (in arithmetic formulae) 3 더하기 6은 9야. ― Sam deohagi yug-eun gu-ya. ― Three plus six is nine. Wikiwand - on Seamless Wikipedia browsing. On steroids.