Metaphor

A figure of speech that makes a direct comparison between two unlike things. A metaphor suggests that one thing is another thing, or is equal to another thing.

Example From Text

…they gave the last full measure of devotion...

Explanation

Here, the comparison is between a concept—devotion—and a physical substance. Lincoln describes devotion as if it were a substance that could be measured, in order to give the concept of devotion a kind of physical weight and importance.