Death
To wade through
To boast of something
To drive somebody mad
Halfway
Bridge
To bring back the dead
To depart this life
To kill oneself
To commit suicide
To recall the dead
Veil
The greek poet Archilochus once said: "Hades is full of brave people."
Socrates drinking hemlock
Nietzsche suffered a type of dementia and died in an asylum where he was admitted after a psychotic breakdown.
The 'Día de los Muertos' in Mexico.
In popular culture we call them zombies.
A similar expression which is widely used is 'to follow the light' when somebody is about to die.
In Greek mythology, people left 3 coins on the body of the dead: one on each eye and one under the tongue, to pay Hades for the trip in the river Styx to arrive to the land of the dead.
To be halfway to death's door
A fine veil is said to separate the world of the dead and the living.
In Britain, when a pet dies, they use the expression: "to go over the Rainbow Bridge."