Indonesian society is multicultural and multilingual. Dialects in Indonesia have a lot of indigenous concepts, which are important for the nation building. In a multilingual society, language contact means that languages with small repertoire can be dominated by languages with larger repertoire (Romaine 2000). The Batak Toba language has concepts about egalitarianism, transparency and harmonizes relation between human being and environment. Most of young Batak Toba generation, who were born and who are living in Jakarta do not speak well Batak Toba language. There is a language shift among them, although they do not speak Batak Toba language, they still master the world views of Batak Toba culture.