The spelling of "wast valid" may cause confusion, as it is not a commonly used phrase. However, the pronunciation can be clarified using IPA phonetic transcription. "Wast" is pronounced /wɑːst/, which is the archaic past tense of "be", while "valid" is pronounced /ˈvælɪd/, meaning something that is sound or legally effective. Together, the phrase could be interpreted as a past tense equivalent of "is valid". Despite its obscurity, understanding the pronunciation of "wast valid" can help improve one's grasp of pronunciation and vocabulary.
The term "wast valid" is not a commonly used phrase, and it does not have a specific etymology. However, it appears to be a combination of two separate words: "wast" and "valid".
The word "wast" is an archaic form of "was" or "were" used in Middle English, which was spoken from the 11th to the 15th century. In this context, "wast" is the second-person singular past tense of "be". For example, instead of saying "you were", people would say "thou wast".
The word "valid" originates from the Latin word "validus", meaning strong or effective. It entered English through the French language in the late 16th century, and it has retained a similar meaning of being sound, justifiable, or logically correct.