The problems of describing dialect and common parlance lexemes in a dialect dictionary are raised in the article. These problems are illustrated by the example of the word chyo. The aim of the study was to reflect the issues caused by the use of such words (and the word chyo too) in dialect speech in content, formal and functionalcommunicative aspects, in connection with general issues of lexicographic theory. The material for the study was the card file for the Dictionary of Russian Folk Dialects, data from regional dictionaries. The identified problems form two main groups: 1) related to general methodological guidelines (justification for including the dialect and common parlance words in a dialect dictionary) and 2) related to the principles of describing such lexemes in a dictionary entry. Within the first group, particular questions are highlighted: 1) about the correctness of including dialect and common parlance words in a differential dialect dictionary due to their functional and stylistic attribution, 2) about the differentiation of speech variants of dialect and common parlance words. Within the second group, particular questions are highlighted: 1) on the spelling of dialect and common parlance words: a) on the spelling of header words, b) on the spelling of dialect and common parlance words in illustrative material, 2) on the lexico-grammatical attribution of dialect and common parlance words, 3) on the definition of semantics of dialect and common parlance words: a) on the definition of semantics of dialect and common parlance words in a specific context, b) on the definition of semantics of polysemantic dialect and common parlance words, 4) on the determination of the status and description of the combinations of dialect and common parlance words with other words, 5) on the reflection of the functional and communicative status of dialect and common parlance words in a dictionary. It is concluded that the raised problems determine approaches to the lexicographic description of dialect and common parlance vocabulary in dialect dictionaries. Dialect lexicographers should work taking into account active processes in live spoken speech and language, and rely on the modern theory of discourse. The problems lexicographers face require special training in virtually all areas of modern linguistic and lexicographic theory. Lexicographers have a high responsibility in making a decision that can lead to the overcoming of problems that have arisen when writing a dictionary entry, as well as to the emergence of new ones.