What are metaphor rules?

Answer 1

It's like a simile, but without like or as, so an example would be:

You are a pig when you eat.

If you want a simile with that an example:

You are like a pig when you eat.

Answer 2

In a metaphor, two unrelated objects or ideas are compared without using "like" or "as". Metaphors should be clear and make sense in the context. Avoid mixing metaphors, as it can confuse the intended meaning of the comparison.