The phrase "under thing" is spelled with the IPA phonetic transcription [ˈʌndər θɪŋ]. The first syllable is pronounced with the short u sound, followed by the consonant cluster nd, and the schwa sound in the third syllable. The final syllable ends with the voiceless th sound and the short i vowel sound. This phrase is commonly used to refer to something that is located beneath or below another thing. It's important to spell words correctly to ensure clear communication and understanding in writing and speech.