This paper studies the effect of ongoing contact on the Abui reduplication system. Abui, a Papuan indigenous minority language of eastern Indonesia, has been in contact with the regional lingua franca, Alor Malay (Austronesian), for around 50–60 years. Throughout this period, contact with Alor Malay has affected different age groups in different ways across various levels of grammar. Here we compare Abui reduplication across four age groups: (pre)adolescents, young adults, adults, and elders, and show how the function and distribution of reduplication in the Abui spoken by younger speakers is affected by a combination of morphological PAT borrowing and lexical borrowing from Alor Malay. The changing patterns are first applied to the domain in which the two languages overlap: existing Abui verb reduplications become more Alor Malay-like with respect to their function, form, and productivity. The borrowing of an additional function of reduplication is analyzed as a type of complexification in Abui, while at the same time, Abui reduplication itself is demonstrated to also show simplification in terms of form. We argue that this change is induced by decades of stable bilingualism, and is further enhanced by the fact that reduplication is a universal morphological operation and can emerge spontaneously in language contact situations. Thus, the emerging trends reported here are explained by both borrowing from Alor Malay as well as incomplete acquisition of Abui.