This essay analyzes how James Joyce de-mythifies language through the use of irony in "Oxen of the Sun" episode and how he records the rebirth of language. This analysis is based on Roland Barthes` theory on myth and SØren Kierkegaard`s theory on irony. According to Barthes, myth is a depoliticized language, which turns history into nature. According to Kierkegaard, irony can be defined as "infinite absolute negativity." Irony, this essay argues, can demythify, disillusion, and thus reincarnate language. In "Oxen of the Sun" episode, Joyce seems to entwine the birth of Purefoy`s baby along with the birth/rebirth of language. Especially the part in which a real Irish bull appears on the text through a fable of colonialism lays bare the political intentions hidden in the mythified language. The idiom "irish bull" means "a self-contradictory proposition, an expression containing a manifest contradiction"; the idiom "an Irish bull in an English chinashop" is a proverbial expression for blundering and destructive clumsiness. These idioms, an example of mythified language, can be used as an alibi for British colonialism for the Irish who, according to the idioms, cannot think logically or act carefully enough to control themselves. By bringing the literal bull onto the text as a symbol of the colonizer, Joyce tries to retrieve the original, political, signified of language before mythification. In "Circe," Joyce coins a term "buybull" in order to criticize religion`s collusion with commercialism and colonialism. In this way, Joyce frees language from the fetters of depoliticizing mythification. The emancipated language takes the forms of drinkers` chaotic conversation in the very last part of the episode, so-called "oxen tail," which embodies "heteroglossia." After all, what is born in "Oxen of the Sun" chapter is not only Purefoy`s baby; the depoliticized, fossilized, and mythified language is reborn in the form of heteroglossia transcending all the canonized writers` styles.