Psychologists have examined the difference between regular metaphor on the one hand and simile, analogy, and the like on the other, but this has not had much influence on the discussion in linguistics of metaphor in language and thought (e.g. Bowdle and Centner, 2005; Glucksberg, 2001; Chiappe and Kennedy, 2001). It is my aim in this chapter to examine and develop the relations between these proposals about metaphor in language from a discourse-analytical perspective. If we assume that metaphor in discourse is the linguistic manifestation of a conceptual cross-domain mapping, as many metaphor researchers do, the question arises how the three types of metaphor distinguished above can be understood within that theoretical framework. I believe that the study of discourse, defined as concrete events of language use, is able to refine our view of the nature and function of the various phenomena involved. I will therefore offer a theoretical consideration of the position of metaphor in discourse in section 1, and then move on to the ways metaphor can be operationalized for the study of discourse in section 2. Section 3 will then analyse the three types of metaphor against this light, and offer a new linguistic taxonomy for metaphor in discourse that builds on from, and integrates, the developments [in CL metaphor analyses. (RD)] (GerardSteen)