The spelling of the word "grippo" can be explained using the International Phonetic Alphabet (IPA). The initial sound is a voiceless velar fricative, represented by the symbol /x/. This sound is followed by a voiced bilabial plosive, which is spelled as "pp" in the word. The next sound is a close-mid back rounded vowel, represented by the symbol /o/. Finally, the word ends with a voiced dental plosive, spelled as "d" in the word. Therefore, the IPA transcription of the word "grippo" is /xɪpoʊd/.