The spelling of "oat chest" can be explained using the International Phonetic Alphabet (IPA). The first syllable, "oat," is pronounced /oʊt/ with a long "o" sound and a "t" at the end. The second syllable, "chest," is pronounced /tʃɛst/ with a "ch" sound followed by a short "e" sound and a "st" at the end. Together, these syllables create the word "oat chest," which refers to a chest or container used for storing oats.