This document discusses metaphor and metonymy. [1] Metaphor involves understanding one conceptual domain in terms of another domain through similarity or analogy. Metonymy involves understanding one domain in terms of another associated domain through physical or causal proximity. [2] Examples of common metaphors include ARGUMENT IS WAR and TIME IS MONEY. Examples of common metonymies include PART FOR WHOLE and PRODUCER FOR PRODUCT. [3] Metaphor and metonymy are pervasive in both everyday language and abstract thought, and involve complex cognitive mappings between conceptual domains.