Metaphor
How one thing is spoken of in terms of another: the mechanics of metaphor, its varieties, and its role in thought and science.
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A metaphor is a figure of speech in which a word or phrase denoting one thing is applied to another, without the explicit comparison words "like" or "as": "time is a thief," "the sea is a wild beast," "all the world's a stage." Aristotle defined it in the Poetics as giving a thing a name that belongs to something else, and he regarded it as a sign of linguistic genius — the one element of style that cannot be taught. It differs from simile, which states the comparison explicitly, and from metonymy, which substitutes a related thing ("the crown" for the monarchy), and synecdoche, which uses a part for the whole ("wheels" for a car).
In the rhetorical tradition a metaphor has three parts: the tenor, the subject being described; the vehicle, the image it is described in terms of; and the ground, the shared features that make the transfer intelligible. I. A. Richards introduced this terminology in the 1930s. In "the ship plows the sea," the ship is the tenor, the plow is the vehicle, and the shared ground is the laborious, purposeful movement through a resistant medium. A metaphor works by selecting some features of the vehicle and suppressing others — every metaphor highlights and hides at once.
Metaphors are conventionally divided into dead and live. Dead metaphors, such as "table leg" or "the heart of the matter," have lost their image content and are processed automatically; live metaphors, freshly coined or striking, force the reader to construct the mapping actively. Extended metaphors (conceits) carry one image through a whole passage or poem, and mixed metaphors combine incompatible images with unintentionally comic effect — "to take arms against a sea of troubles" is the classic Shakespearean example of a seam between the military and nautical domains.
The twentieth century made a stronger claim. In Metaphors We Live By (1980), George Lakoff and Mark Johnson argued that metaphor is not ornament but thought: that conceptual metaphors — ARGUMENT IS WAR, TIME IS MONEY, LOVE IS A JOURNEY — systematically structure how we reason, and that they are grounded in bodily experience. The claim that such mappings are stored in the mind and shape reasoning is supported by a large experimental literature, though its strongest versions remain debated within cognitive science.
In literature, metaphor compresses meaning: Emily Dickinson's "Hope is the thing with feathers" fits an entire theory of hope into a single image. In science, metaphor is a working tool — "electric current," "the genetic code," "the cell as factory" — enabling inference from a familiar domain to a new one, while also risking the import of misleading implications. Studying metaphor is therefore not only a literary exercise but a way of seeing how language, thought, and knowledge are built together.
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language literary devices rhetoric