The phrase "bent up on" may cause confusion for English speakers due to the unusual spelling of the word "up". In IPA phonetic transcription, "bent up on" is pronounced as /bɛnt ʌp ɒn/. The vowel sound of "up" is pronounced as a short u sound /ʌ/ as opposed to the expected long u sound /u/. This is likely due to the influence of regional dialects or accents. It is important to be aware of these spelling and pronunciation variations to effectively communicate with others.