The current usage and definitions of the word ‘veryansın’ and the idiom ‘veryansın etmek’ (to destroy without mercy) in the Turkish Dictionary which is published by the Turkish Language Society, are discussed in this paper. From the first edition of the Turkish Dictionary, the semantic changes of these words attention draw attention. In contemporary Turkish, this word and the phrase in which it takes place have gained new meanings. In this work, how these meaning changes and their definitions in the dictionary are examined, the type, origin and usage forms of the word in historical periods are discussed. In the light of the data obtained from the literary language, written sources and corpus, new definitions of the word ‘veryansın’ and the idiom ‘veryansın etmek’ (to destroy without mercy) are made.