The spelling of "dis grade" is quite straightforward once you understand the phonetic transcription. In IPA, "dis" is pronounced as "dɪs", meaning the "i" sounds like the "i" in "sit". "Grade", on the other hand, is pronounced as "ɡreɪd", with the "ai" sounding like the "a" in "day". Therefore, the correct spelling of this word is "dis grade". It is important to pay attention to the phonetic transcription of words, as it helps in understanding the correct way to spell and pronounce them.