Implementation of Boris Larin’s concept of the spoken everyday Russian language in the past and the present

In the middle of the XX century, the problems of formation and development of the modern Russian language with the explanation of its structure as a national language were actively discussed in Russian linguistics. In the system of the philological and philosophical discussion of this problem, B. A. Larin proposed an idea, relevant for its solution, but not yet satisfactorily substantiated, of understanding the essence and formation of spoken Russian as part of the national language, taking into account the lexical level. To achieve this goal, according to B. A. Larin, it is necessary to analyze in detail the linguistic material of different centuries, which, in turn, will allow to establish the period of formation of the national language. The combination of synchronic and diachronic approaches to the study and comprehension of the vocabulary of Russian colloquial speech is reflected in Pskov Regional Dictionary with Historical Data and Dictionary of Everyday Russian Language of Moscow Russia in the XVI-XVII Centuries, famous lexicographic works, in the development of which B. A. Larin was actively engaged together with his students. B. A. Larin is also credited with the introduction of new sources for the study of colloquial speech of the Russian Middle Ages: Russian Grammar by Heinrich Ludolf, the Russian-English vocabulary and diary by Richard James, etc. The development of the idea of everyday colloquial language (studies, dictionaries) proposed by B. A. Larin confirms the authenticity of the plans and vitality of the Larin’s scientific school.