Language plays an important role as the immigrants gain and loss many languages in the cosmopolitan journey. The “Cosmopolitan Tongues in Jhumpa Lahiri’s Unaccustomed Earth” begins with English as a global language and narrows to immigrants’ cosmopolitan language. It gives numerous instances pertaining to the language gain and loss. In cosmopolitan life, people mostly lose their native tongue and adopt the world language. This paper deals with the language conflict becomes a branch of multinational life and also sees the linguistic future of the world citizens.