The correct spelling of the phrase "wast safe side" is actually "wasn't safe side." The word "wasn't" is a contraction of "was not" and should be spelled with an apostrophe to represent the omitted letter "o." The word "safe" is pronounced as /seɪf/, and the pronunciation of "side" is /saɪd/, both ending with a voiced consonant sound /f/ and /d/, respectively. Therefore, the correct spelling and pronunciation of this phrase should be "wasn't safe side."