The correct spelling of the phrase "doest one bidding" is actually "does one's bidding." The confusion in spelling may arise from the archaic use of "doest" as a form of the verb "do" in early Modern English. The correct pronunciation of "does" is /dʌz/ (dʌz) with a short "u" sound, while "bidding" is pronounced as /ˈbɪdɪŋ/ (ˈbɪdɪŋ) with a short "i" sound. So the correct IPA transcription for the phrase would be /dʌz wʌnz ˈbɪdɪŋ/.