I forgot to mention that there are in fact two compounds in the phrase "udaya-attha-gaaminiyaa". "atthagaaminiyaa" is as stated an accusative tatpuru.sa (P. tappurisa) compound, but the overall compound ("udaya-attha-gaaminiyaa) is a dvandva (P. dvanda), meaning "rise and fall", modifying wisdom ("pa~n~naaya") Hope that is clear. So in the original phrase "udaya-attha-gaaminiyaa pa~n~naaya samannaagato", the whole compound would probably be in genitive case ("endowed with wisdom of the rise and fall...") modifying wisdom; the word attha is the object of gaaminiyaa and together the two form a tappurisa accus. compound which has together come to have the meaning of a single word, the noun, "disappearance" (lit: "going home"); and the words udaya and attha-gaaminiyaa are a dvanda, i. e. two nouns joined by "and" ("rise and fall"). It can get a little confusing and hope this is clear,
Metta, Bryan
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