The spelling of the word "Sulliage" may seem unusual to native English speakers, but it follows the standard English spelling rules - "sull" as in "sully" and "-iage" as in "garage". The IPA phonetic transcription of the word is /ˈsʌl.i.ɪdʒ/, with stress on the first syllable. The word is not commonly used in everyday English, but it means the process of converting sewage into a form that can be safely discharged into the environment.