The correct spelling of the phrase "more summing" is somewhat of a mystery, as it is not a commonly used term. However, the word "summing" is pronounced with the phonetic transcription /ˈsʌmɪŋ/, indicating that the "u" sound is short and the "i" sound is long. Without more context, it is difficult to determine the correct spelling of "more summing." It is possible that it could be spelled as "moresumming" or "more-summing" depending on the intended meaning.