The spelling of the word "slahi" can be best explained using the International Phonetic Alphabet (IPA) transcription. The first sound is "s" which is followed by the "l" sound. After that, we have the "a" sound, which is pronounced as "æ" in IPA. The fourth sound is "h" which is a silent consonant in this word. Lastly, we have the "i" sound which is pronounced as "ɪ" in IPA. Therefore, the correct IPA transcription for "slahi" is /slɑːhi/.