The spelling of the phrase "not generally in use" is straightforward, but the pronunciation can be tricky. The IPA transcription for this phrase is /nɑt ˈdʒɛnərəli ɪn ˈjus/. In other words, the "not" is pronounced with an "ah" sound and the "generally" is pronounced with a soft "g" and a stressed "ly." The "in" is pronounced with a short "i" sound, and the "use" has a Z sound, unlike the spelling, which looks like an S. Overall, it's important to pay attention to these subtle differences to ensure accurate pronunciation.