The spelling of the word "busi" is incorrect. The correct spelling is "busy." The word is pronounced as /ˈbɪzi/ in IPA phonetic transcription. The phonetic transcription indicates that the second syllable of the word is pronounced as "zi" with a short "i" sound. This word means having a great deal to do or occupied with a particular activity. So, make sure to spell it correctly when you use it in your writing or communication.