The spelling of the word "hide thing" can be explained using the International Phonetic Alphabet (IPA). The first word, "hide", is pronounced as /haɪd/, with the vowel sound represented by /aɪ/ and the final consonant sound represented by /d/. The second word, "thing", is pronounced as /θɪŋ/, with the initial consonant sound represented by /θ/ and the vowel sound represented by /ɪ/, followed by the nasal consonant sound /ŋ/. The combination of these two words creates a common phrase used to describe something that is being concealed or kept secret.