The article deals with the importance of using idioms, peculiarities, semantic meanings, and formation of idiomatic expressions. In this article, idioms with the concept “black” in the English and Karakalpak languages have been analyzed and examples are provided. Comparative and descriptive methods analyses are used in this article. The article gives information about the problem of understanding and using idioms with foreign speakers lies in the definition of an idiom. Also, in the article, black color in the Karakalpak culture is explained and the reason of why this colour mostly associated with the negative concepts has been defined.