The spelling of the word "deyu" can be explained using IPA phonetic transcription. The first syllable is pronounced as "də", with the symbol "ə" representing the schwa sound. The second syllable is pronounced as "ju", using the symbol "j" to represent the consonant sound in "yew". Together, the word is pronounced as "də-yoo". While the meaning of "deyu" is unclear without context, understanding the phonetic transcription can aid in proper pronunciation and spelling.