The spelling of the word "Big Tuck" can be explained using the International Phonetic Alphabet (IPA). The first syllable, "big," is spelled with the sound /b/ followed by the vowel sound /ɪ/. The second syllable, "tuck," starts with the voiceless velar plosive /k/ and includes the vowel sound /ʌ/ and the consonant sound /t/. Therefore, the spelling of "Big Tuck" can be represented in IPA as /bɪɡ tʌk/.