For me, depression is walking across the street without looking both ways.
It's sitting in a car wishing an accident would come, wishing you would be the only casualty.
It's cooking everything despite not wanting to, eating everything in sight just because there's a slim chance of dying from poison.
It's staying out in the rain and never moving, staring in the distance. Waiting for a branch to knock me unconscious.
It's staying up till dawn knowing you have to be up early the next day.
It's zoning out at random intervals because you have no energy anymore.
It's staying in your room unless necessary.
It's staying in bed until life comes knocking at the door.
It's losing inspiration on things you previously liked.
To me, these are the meaning of depression.