The spelling of the word "most reoccurred" can be confusing. The first syllable is pronounced /moʊst/ with a long o sound. The second syllable is spelled with two c's and two r's, but is pronounced as a single /k/ sound: /riˈkʌrd/. The third syllable is pronounced with a long o sound followed by a short u sound: /ərd/. So the correct IPA phonetic transcription of the word is /moʊst riˈkʌrd ərd/. Despite the tricky spelling, "most reoccurred" means something that has happened frequently.