The correct spelling of the phrase "brake neck" is actually "breakneck." This refers to something that is extremely fast or dangerous. The IPA transcription for "breakneck" is /breɪk.nek/. The "br" sounds like the "br" in "brain," while the "eɪ" sounds like the long "a" in "bake." The "k" is pronounced like a hard "k," and the "n" sounds like the "n" in "neck." With the proper spelling and phonetic understanding, one can effectively convey this phrase in their writing and speech.