The spelling of the word "donchin" can be explained using IPA phonetic transcription. The first syllable "don" is pronounced as /dɑn/, with the "o" sound being a long vowel sound. The second syllable "chin" is pronounced as /tʃɪn/, with the "ch" being a voiceless palato-alveolar affricate sound. Therefore, the correct spelling of the word "donchin" is a combination of the phonetic sounds of "dɑn" and "tʃɪn." It is important to use proper phonetic transcription to ensure accurate spelling of words.