The spelling of "unitedded marriage" may seem unusual, but it is correctly spelled with double "d" to indicate a past tense form. The first syllable is pronounced with the schwa sound, /ə/, while the second syllable begins with a voiced dental fricative /ð/. The second "d" is pronounced as a flapped or tapped /ɾ/ sound, which occurs when a single consonant is between two vowels in American English. Overall, the IPA transcription for "unitedded marriage" is /juˈnɑɪtədɪd ˈmærɪdʒ/.