This research project focuses on the compilation and analysis of a dictionary specifically tailored to the most frequently used idiomatic expressions in the English language. It provides a comprehensive resource for language learners, educators, and researchers. The dictionary will not only define each idiom but also provide insights into its etymology, contextual usage, and potential variations. Furthermore, the project will incorporate a system for categorizing idioms based on their semantic fields and communicative functions, facilitating a deeper understanding of their nuanced meanings. The methodology will encompass a corpus-based approach, leveraging large-scale textual data to identify, categorize, and validate the relevance and frequency of the idioms included. This detailed examination aims to create a valuable tool for improving proficiency in English, promoting a more natural and sophisticated command of the language, and aiding in the development of more effective pedagogical strategies for idiom instruction. The project's structure will incorporate both theoretical and practical dimensions, allowing for a multifaceted approach to idiom comprehension and application throughout different learning stages. The outcome will be a meticulously crafted resource designed to be a definitive reference for anyone seeking to improve their grasp of English idioms.