The phonetic transcription of "wast subsequent" is /wɑːst ˈsʌbsɪkwənt/. In this phrase, "wast" is a specific archaic form of the word "was" which is no longer commonly used. It means the same thing as "was". "Subsequent" means following something in time, order or place. The word is spelled with a "c" and not a "q" because the Latin root word it comes from is "sequi" which means "to follow".