What type?
John runs as fast as lightning.
Simile
I'm feeling as sick as a dog.
I'm to dog.
Why don't you zip your lip?
You need to be quiet.
The trees danced back and forth in the wind.
After eating, I felt as fat as a pig.
I to pig.
He threw in the towel after losing the game.
He gave up.
I wish you weren't always such a chicken.
Metaphor.
Joe thinks he is the class clown.
Joe to a clown.
Brittney was feeling under the weather.
She felt sick.
My little sister works as slow as a turtle.
Jill to baby.
It's raining cats and dogs out there.
It's raining hard.
She cried crocodile tears.
Idiom.
Without my glasses, I am as blind as a bat.
I to bat.
Go play outside, don't be a couch potato.
A couch potato is a lazy person who doesn't want to do physical activity.