In simple terms

A metaphor describes one thing as though it were another, so the qualities of the second carry over to the first. Calling a stubborn problem a wall, or a sharp remark a blade, is metaphor at work: the problem is not masonry and the remark is not steel, but the comparison says something a literal description would miss.

The word comes from the Greek metaphora, meaning a transfer or a carrying over. [2] A metaphor makes its comparison directly, without the signal words like, as or than. [1]

How it works

Reference works define metaphor as a comparison between things that are not really alike, or the use of a name or description for something it does not literally fit. [2] The test is the missing signal word. A simile says a voice is like gravel. A metaphor says the voice is gravel, and leaves the reader to make the connection. [1][2]

In poetry, metaphor builds an image the reader can see, setting an object, person or action against something unexpected. [2] Emily Dickinson presents hope as a small bird that lives inside the self; Sylvia Plath describes a dead father in the vocabulary of stone and weight. [1] Most metaphors, though, pass unnoticed. Prices climb, deadlines loom, talks collapse. These are dead metaphors: the comparison has worn smooth with use.

Why it matters

Metaphor is the main way unfamiliar things are explained in familiar terms, which is why technical fields depend on it. A computer has a desktop and folders, an economy overheats, a genome is read like text. The compression is useful, and also quietly directive: a metaphor decides which features of a subject you notice. Describing a policy debate as a war makes some responses sound obvious and others sound like surrender. That reading is interpretation rather than settled fact, but it is why teachers treat metaphor as part of an argument, not decoration on it.

Where you’ll see it

• Poems, song lyrics and fiction, where metaphor does most of the descriptive work
• News headlines and political speech, which compress a position into one image
• Everyday idioms in any language, most of them dead metaphors
• School and exam questions that ask you to tell a metaphor from a simile

Example

A coach who tells the team the final is a mountain they have trained all season to climb is using a metaphor: the match is not a mountain, but the comparison carries both height and effort.

Often confused with

A simile makes the same kind of comparison but announces it with like or as, so it asks less of the reader. [2] An analogy goes further, mapping several parts of one thing onto another.

Editorially reviewed by Specialty Digest Editorial TeamLast reviewed October 7, 2026Researched and drafted with AI assistanceReport an issue