Idioms vs. Metaphors

While both idioms and metaphors are forms of figurative language, they function differently in how they convey meaning. The primary distinction lies in whether the meaning can be deduced from the words themselves.

Idioms

An idiom is a phrase where the meaning is culturally established and cannot be understood by looking at the individual words. If you translate an idiom literally into another language, it usually loses all meaning.

Metaphors

A metaphor is a figure of speech that describes an object or action in a way that isn’t literally true, but helps explain an idea or make a comparison. It states that one thing is another thing to highlight a shared characteristic.

The Overlap

It is possible for a phrase to be both. For example, "burn the midnight oil" is a metaphor (comparing hard work to the consumption of oil in a lamp), but because it is a fixed, widely recognized expression, it is also classified as an idiom.

In general, think of a metaphor as a creative tool used to describe something, while an idiom is a "pre-packaged" expression used by a specific group of people.