The phrase "falling up on" is often misspelled as "falling upon" due to the similarity in pronunciation. The correct spelling is "falling up on," where the stress falls on the second syllable of "falling" and the "up" is pronounced with an "uh" sound. The phonetic transcription for "falling up on" is /ˈfɔlɪŋ əp ɑn/. It is important to use the correct spelling to avoid confusion or misinterpretation in written communication.