The correct spelling of the phrase "dost takeoff of" is actually "does takeoff of." The word "does" is the third-person singular form of the verb "do," which means "to perform or execute." The IPA phonetic transcription of "does" is /dʌz/. Therefore, the correct pronunciation of the phrase would be /dʌz ˈteɪkˌɒf ʌv/. It is important to ensure correct spelling, as errors can lead to confusion and misunderstandings.