A metaphor is calling something or someone by another name for the purpose of drawing a similarity between the two.
Example: You are a fox.
This use of metaphor is suggesting that the person has the cunning nature of a fox.
- Tom Brady was a snake.
- John is a sheep.
What is one characteristic of sheep? They follow each other. So we can imagine that George is a follower, not a leader. In this sentence "sheep" is a metaphor.
Here again a person is called a snake not meaning that the person is a literal snake but to suggest they have the qualities of a snake.
You can tell if there is a metaphor if you see a comparison that does not use or include the comparative terms “as” or “like”.