Two parallel sets of sound correspondences are attested in the historical phonology of the Uab Meto (also known as Dawan[ese], Timorese, Atoni) language/dialect cluster. A top-down approach to the data reveals one set of regular sound correspondences in reflexes of Proto-Malayo-Polynesian lexemes, while a bottom-up approach to the data reveals another set of regular correspondences in lexemes for which no Malayo-Polynesian origin has yet been found. I examine each set of sound correspondences in detail and propose a framework for addressing the apparently contradictory data.