The correct spelling of the phrase "study at dumb" is actually "study abroa d um." The IPA phonetic transcription for this phrase is /ˈstʌdi əˈbrɔːd ʌm/. The confusion likely arises from the fact that "abroad" and "um" have similar sounds in English, and the two words can easily be misheard. However, it is important to use the correct spelling to avoid misunderstandings and confusion. So if you're planning to study in another country, make sure to say "abroad" instead of "dumb"!