have one foot in the grave
knock on heaven's door
have had it
knocking on heaven's door
on one's deathbed
pass in one's checks
take a dirt nap
sputter out
bite the dust
meet one's doom
go belly-up
pay the debt of nature
hand in one's checks
demise
cash in one's chips
pass the river
cop one's whack
drop off the hooks
meet one's end
go the way of all the earth
slip one's wind
quell
succumb
cark it
buy it
cock one's toes
croak
peg out
pop one's clogs
hand in one's dinner pail
check out
kick the bucket
cross the Styx
join the choir invisible
pass
flatline
draw one's last breath
bite the big one
depart
go to sleep
suck the kumara
keel over
go home
turn to dust
bite the biscuit
peg it
go out
kick
toddle off
pass on
go
pass away
querk
fall off one's perch
expire
turn up one's toes
cash in
snuff it
deathwards
close one's eyes for the last time
return to dust
conk out
transition
push up daisies
passing
dying
moribund
deathward
meet one's maker
eat it
sleep
mortally
with one's last breath
deathly
euthanatize
euth
kill
help along
terminally
in extremis
on the way out
in articulo mortis
celestial transfer
way of all flesh
one's number is up
near-death experience
doom
big sleep
curtain
check-out time
end
fatality
last roundup
expiry