To die
Kick the bucket
pass over to the other side
pass on
Shuffle off this mortal coil
bite the dust
Breathe your last
Pop your clogs
Meet your maker
To be dead
Sleeping with the fishes
Pushing up the daisys
Brown bread (Cockney rhyming slang)
Six feet under
Beyond the veil
worm food
Dead as a doornail – to be very dead
To be nearly dead
To be at death’s door