The spelling of "Eastburn" can be explained phonetically using IPA transcription as iːstbərn. The first syllable starts with the long vowel sound "ee" followed by "st" which represents the consonant cluster of "s" and "t". The second syllable starts with a schwa sound "uh" followed by "b" and "rn" which represents another consonant cluster. This spelling accurately reflects the pronunciation of the word and demonstrates the importance of phonetic transcription in understanding and correctly spelling words.