The spelling of the word "most cased" can be explained using IPA phonetic transcription. The first syllable "most" is pronounced as /moʊst/, with the long "o" sound and the "st" consonant blend at the end. The second syllable "cased" is pronounced as /keɪst/, with the long "a" sound and the "st" consonant blend at the end. This spelling accurately represents the pronunciation of "most cased" and allows for clear communication of the intended word.