This research is based on the study of metaphor and its impact in Arabic language, and we have begun our work identifying the concept of metaphor linguistically and idiomatically, then we indicated its multiple divisions that we have found mentally, and linguistically divided into metaphor, and expedite metaphor, then we moved to talk about its impact on the language, which manifests itself into two types: direct rhetorical, and indirect linguistic as a factor of linguistic expansion through its contribution to the formation of semantic relations, in addition to its role in the semantic evolution of the language words and their meanings to cope with the requirements and developments of life, by addressing some examples on the base of mentioning but not limitation, and we studied some words analytically showing the effect of metaphor on their development, and how we currently use them, then comes the findings of the research.