Introduction. In recent decades, the term “syntactic concept” has appeared in the research literature along with the term “lexical concept”. This linguistic unit is not only a structural, but also a semantic element of the utterance. When used in a sentence, words cease to exist as separate lexical units, they enter into predicative relationships for the sake of a single goal – to create a semantic space or field. From the formal side, a significant part of such sayings consists of all sorts of combinations of function words with each other and with significant parts of speech. They are equally active in both Russian and Chuvash languages. The relevance of the research topic is determined by the lack of a systematic description of the units under consideration within the framework of the national and cultural specifics of emotional and evaluative linguistic means, in this case phrasemes and communicemes. The purpose of the study is to identify and describe the most commonly used phrasemes and communicemes of the Chuvash language, to emphasize the features transmitted by these syntactic units in the process of their functioning in language and speech. Materials and methods. The empirical basis of the research was made up of phrasemes and communicemes of the modern Chuvash language, extracted from the fiction of Chuvash writers, folklore materials and lexicographic sources. In the process of analyzing and systematizing the factual material, the continuous sampling method, contextual analysis, comparative, and descriptive methods were used. Research results, discussion. This article analyzes phrasemes and communicemes of the Chuvash language, describes their semantic and functional features in order to achieve the desired effect from the addressee. Being expressive means of language, these units are widely used in colloquial and dialogical speech, and are distinguished by their laconic form and content plan. The paper also considers the issues of semantic classification of these units. The results and conclusions of the study can be used when reading courses on the expressive syntax of the Chuvash language and linguoculturology.