The phrase "art out breath" can be spelled phonetically as /ɑːt aʊt brɛθ/. The first syllable, "art," has an /ɑː/ vowel sound like in the word "car." The second syllable, "out," has an /aʊ/ diphthong sound like in the word "house." The third syllable, "breath," has an /ɛθ/ consonant sound like in the word "death." Overall, the spelling of this phrase follows standard English phonetic rules and accurately represents the pronunciation of the words.