Abstract
This study examines the ethnocultural properties of phraseological units in the language of written monuments from the Middle Ages (10th–15th centuries). This era is significant in the history of the Turkic peoples, marked by events such as the Karakhanid rule, the formation of the Kipchak Confederation, the Mongol invasion, and the prosperity of the Golden Horde. The written monuments of this period provide linguistic and cultural insights into Turkic languages, including modern Kazakh. The research aims to analyze the worldview and lifestyle of Turkic peoples by identifying the ethnocultural aspects of stable phrases in medieval written texts and their equivalents in contemporary Kazakh. A comparative analysis of phraseological units from medieval sources and modern dictionaries was conducted. The study identifies continuity in linguistic structures and ideological concepts, systematizing phraseological units into three categories: phraseological unity, phraseological unit, and phraseological chain. Findings highlight that phraseological units preserve cultural and spiritual values, reflecting the national character and psychology of Turkic peoples. The research contributes to understanding the cumulative function of language and its role in transmitting cultural heritage.