buka usbu

== Indonesian == === Etymology === Compound of buka +‎ usbu, borrowed from Ambonese Malay [Term?]. === Noun === buka usbu (plural buka-buka usbu) (Christianity) early week worship for Christians, held on Monday === Further reading === “buka usbu”, in Kamus Besar Bahasa Indonesia [Great Dictionary of the Indonesian Language] (in Indonesian), Jakarta: Agency for Language Development and Cultivation – Ministry of Education, Culture, Research, and Technology of the Republic of Indonesia, 2016