" Wast ones back" is not a commonly used phrase, and its spelling may cause confusion. However, its pronunciation can be explained using IPA (International Phonetic Alphabet). "Wast" is pronounced as /wɑːst/ with a long "a" sound, and "ones" is pronounced as /wʌnz/ with a short "u" sound. "Back" is pronounced as /bæk/ with a short "a" sound. Together, the phrase is pronounced as /wɑːst wʌnz bæk/. Despite its unusual spelling, IPA makes it easier to understand how "wast ones back" should be pronounced.