The spelling of the word "does sly" may seem unusual, but it is phonetically accurate. In IPA phonetic transcription, it is spelled as /dʌz slaɪ/. The first two letters, "du," are pronounced with the short vowel sound "uh," followed by the "z" sound. The word "sly" is pronounced with a long "i" sound, represented by the IPA symbol /aɪ/. The combination of the two words creates a unique and memorable phrase. It is important to study and understand the phonetic origins of uncommon spellings.