The spelling of "wast on a team" may seem confusing, but it can be explained using IPA phonetic transcription. The correct pronunciation is /wɑːst ɒn ə tiːm/. The word "wast" is the archaic second person singular form of "be" and is pronounced as "wahst". "On" is pronounced as "ɒn" with a short "o" sound, and "a team" is pronounced as "ə tiːm". So, the correct spelling of this phrase might look strange, but with the help of phonetic transcription, its pronunciation can become clearer.