The phrase "wast one case" is not a commonly used expression in modern English. However, the spelling of the word "wast" as it appears in this phrase is an archaic form of the word "was." This spelling can be explained using the International Phonetic Alphabet (IPA) symbol /wʌz/. The pronunciation of "case," written as /keɪs/, refers to a container or covering for an object. Overall, the phrase "wast one case" has a historical and somewhat outdated usage but still serves as an example of archaic spelling.