A dead metaphor is a figure of speech which has lost its original imagery of its meaning due to extensive, repetitive, and popular usage. Because dead metaphors have a conventional meaning that differs from the original, they can be understood without knowing their earlier connotation. Dead metaphors are generally the result of a semantic shift in the evolution of a language, a process called the literalization of a metaphor. A distinction is often made between those dead metaphors whose origins are entirely unknown to the majority of people using them (such as the expression "to kick the bucket") and those whose source is widely known or symbolism easily understood but not often thought about (the idea of "falling in love"). Friedrich Nietzsche argues that "literal" vocabulary is all composed of dead metaphor that has become worn out by over-use and familiarity, though the allusions it makes continue to be influential.
There is debate among literary scholars whether so-called "dead metaphors" are dead or are metaphors. Literary scholar R.W. Gibbs noted that for a metaphor to be dead, it would necessarily lose the metaphorical qualities that it comprises. These qualities, however, still remain. A person can understand the expression "falling head-over-heels in love" even if they have never encountered that variant of the phrase "falling in love." Analytic philosopher Max Black argued that the dead metaphor should not be considered a metaphor at all, but rather classified as a separate vocabulary item.
Dead Metaphor is also the name of a play by George F. Walker.
- Time is running out.
- Pawelec, Andrzej. "The Death of Metaphor" (PDF). Retrieved 2014-11-20.
- David Snowball, Continuity and Change in the Rhetoric of the Moral Majority, p.126
- McKinnon, AM. (2012). 'Metaphors in and for the Sociology of Religion: Towards a Theory after Nietzsche'. Journal of Contemporary Religion, vol 27, no. 2, pp. 203-216. 
- Travers, Michael David (June 1996). "Programming with Agents". Massachusetts Institute of Technology. Retrieved 2009-12-08.
- "dead metaphor". Miriam-Webster. Retrieved 20 November 2014.
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