The correct spelling of "bit at" is actually "bitten". The IPA phonetic transcription for this word is /ˈbɪtən/. It is important to note that the two words "bit" and "at" are separate words with different meanings. "Bit" means a small piece or quantity, while "at" indicates a location or direction. However, when combined, they form a past participle of the verb "to bite". Therefore, the correct spelling is "bitten".