Language is a form of our living. We can express ourselves with the help of it. Language is a soul of every nationality, its saint thing, the dearest treasure. By the level of its development we can judge about the development ot the spiritual side of every nation. As we live in the times when everything is changing quicker than we manage to get used to it, new spheres of life and progress need much more words to describe themselves. Instead of making up new words it is much more convenient to make some changes in tlie old vocabulary. And here we need to use idioms. In my opinion, they make the language more interesting, different and bright. That is why I've chosen this topic tor my future investigation. Idioms can change the meaning of the word by connecting it witli other words with tlie same or other grammatical function and peculiarities. It helps us to omit different linguistic mistakes which can appear during the process ot inventing new words. My investigations showed that it is easier to diversify English language with idiomatic expressions. They do not need making up the new words but caring attitude to the old ones. Idioms do not change the word, they vary it with the new meaning which can provide the right understanding of the new labels. I've tried to find rare and interesting books dedicated to this topic and I tend to think that they helped me to develop and enlarge my work. At the end of it you can find the list of used literature. My work consists of several parts that have different information directions. In the lirst part several ways of appearing new words are described: Changing word literal meaning; Adding suffixes such as -ize, -ization; Adding prefixes such as mini-, maxi-, super-, micro-, mega-; Changing word grammatical function; Joining words together to form one adjective instead of a long phrase; Combining parts of two existing words. The work continues by the description of the idioms and possibilities of their usage. What is an idiom itself? An idiom is a fixed phrase that has its own special meaning. It is often impossible to guess the meaning of the whole forms or structures. An idiom can have a regular structure phrase from the meanings of the separate words that it is formed from My investigation showed that idioms take many different forms or structures. An idiom can have a regular structure, an irregular or even a grammatically incorrect structure. The clarity of meaning is not dependent on the 'grammatical correctness'. The aim of my work was to prove that idioms consist a great part of English language and can help it to develop. The idioms were shown in perspective with the help of the facts from the history of development of the English language. In fact, idiom is just an expression that contains the words \vhich if taken together give the meaning that is different from the meaning ot the each word itself. We can make a conclusion that idioms are the result of language development. New spheres of life need new words to characterize them. hi stead of inventing newlabels it is more convenient to give the new idiomatic meaning to the old words. This practice is widespread in English language. We must not forget about the melodic pronunciation and the variety of word vocabulary which provide the best language perception. Language is an eternal thing, which unites all people around the world.