What is an example of a metaphor?

An example of a metaphor is the sentence “Time is a thief.”

This is a metaphor because it uses a form of the verb “be” to make a figurative statement that something (“time”) is something else (“a thief”). This is done in order to suggest that time steals things away from people, not to make any literal statement.

Metaphor is a rhetorical device that appears in many different contexts, from formal writing to everyday conversation. It should not be confused with simile.