Have you ever wondered why when you're sad you're depressed?

I mean, usually the prefix de- means not.

So depressed would mean not pressed on and pressed would mean pressed on.
Usually when people get depressed is because stress is pressing down on them or they are
unhappy, right?

So shouldn't we be happy and depressed, sad and pressed?

It makes sense, doesnt it?

Just something to tickle your mind.