The word "acho" is spelled as /ˈɑːtʃəʊ/ in the IPA phonetic transcription. The first sound, /ˈɑː/, represents the vowel sound in "car." The second sound, /tʃ/, represents the "ch" sound as in "chocolate." Lastly, the sound /əʊ/, represents the diphthong sound as in "go." The spelling of the word "acho" follows the rules of English pronunciation and is an example of how the transcription system can help us understand the pronunciation of words more thoroughly.