a space is a spade
When someone tries to be clever by saying two things are both similar and opposite, but it’s just stupid.
I said my brother was a space is a spade. He’s just a jerk. He doesn’t need to be a planet.
My teacher said my essay was a space is a spade. It was about space. It didn’t need to be a spade.
My dog said my math homework was a space is a spade. He’s just a dog. He doesn’t know what a spade is.