The spelling of the phrase "wast marked at" can be a bit confusing, but using IPA phonetic transcription can help clarify the pronunciation. "Wast" is pronounced /wɑst/, which is similar to "waste" but with a short a sound. "Marked" is pronounced /mɑrkt/, with a short a sound as well. "At" is pronounced /æt/, which is similar to "cat" with a shorter vowel sound. Altogether, the phrase is pronounced /wɑst ˈmɑrkt æt/.