Metaphor – comparison of two things but not simile (i.e. not using as or like)
To remember this, use the following mnemonic:
Have you met her four (metaphor) sisters? Try comparing them! They are not similar (not simile).
Metaphors compare two things but they don’t use “as” or “like” in the sentence like a simile would.
You are a rock.
Helen had the heart of a lion.
My fingers are icicles.
Life is a roller coaster.