Correct spelling for the English word "APSUPD" is [ˈapsʌpd], [ˈapsʌpd], [ˈa_p_s_ʌ_p_d] (IPA phonetic alphabet).
There is no widely recognized dictionary definition for the acronym "APSUPD" as it does not correspond to a specific term or concept. In cases where acronyms are not commonly used or have limited usage, they may not be included in dictionaries. Additionally, acronyms can have multiple meanings depending on the context in which they are used. It is possible that "APSUPD" may be a specific acronym used within a particular organization, field, or community, but without further information, it is difficult to provide an accurate definition.
If you can provide additional context or information about the term "APSUPD," such as the domain it is associated with or its usage in a particular context, I would be happy to provide a more specific definition or explanation.