The phrase "upping on" is not a commonly used phrase, but its spelling can be explained through the International Phonetic Alphabet (IPA). "Upping" is spelled with a short "u" sound as in "uh" followed by the consonant cluster "pp" and ending with the "ing" sound. On the other hand, "on" is spelled with a short "o" sound as in "ah" and the consonant "n." The phrase can be pronounced as /ˈʌpɪŋ ɒn/.