Classification of Phraseological Units and their Stability and Ideomaticity

The vocabulary of a language is enriched not only by words but also by phraseological units. Phraseological units are word-groups that cannot be made in the process of speech they exist as ready-made units. They are compiled in special dictionaries. The same as words phraseological units express a single notion and are used in a sentence as one part of it. The article is devoted to the survey of the research works and the main issues of Phraseology and phraseological units, which are considered its objective. It analyses the origin of phraseology, linguists, who contributed to this branch of linguistics, criteria of classifying phraseological units and their different classifications.