This research project delves into the intricate realm of English colour idioms, exploring their semantic structures, pragmatic functions, and cultural significance. The study will conduct a comprehensive analysis of various colour idioms, such as 'to be green with envy,' 'to see red,' and 'to feel blue,' examining their origins, evolution, and usage in contemporary English. The research will employ both qualitative and quantitative research methods, including corpus analysis, semantic decomposition, and pragmatic analysis. The project aims to provide a detailed understanding of how colour, as a linguistic component, contributes to the nuanced expression of meaning in English. Moreover, the project will investigate the cultural connotations associated with different colours, shedding light on the socio-cultural contexts that shape the understanding and interpretation of colour idioms. This investigation will contribute to the understanding of the English language and cross-cultural communication.