The phrase "am one back" is spelled using the International Phonetic Alphabet (IPA) transcription system as /æm wʌn bæk/. The first sound is a short "a" sound, followed by the consonant "m". The next sound is a short "u" sound, followed by the consonant "n". Finally, there is the "b" sound, the "a" sound, the "k" sound. This phrase means "I am behind by one point or position". It is commonly used in sports or competition contexts.