Discourse metaphors change both over time and across the discourses where they are used. The source concepts of discourse metaphors refer to phenomenologically salient real or fictitious objects that are part of interactional space (i.e., can be pointed at, like MACHINES or HOUSES) and/or occupy an important place in cultural imagination. Discourse metaphors are illustrated by case studies from three lines of research: on the cultural imprint of metaphors, on the negotiation of metaphors and on cross-linguistic occurrence. The article introduces the notion of discourse metaphor, relatively stable metaphorical mappings that function as a key framing device within a particular discourse over a certain period of time.
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