have one foot in the grave
perish
demise
fall off one's perch
hand in one's checks
pass the river
kick
go to sleep
bite the biscuit
go out
go the way of all the earth
cash in one's chips
expire
querk
hand in one's dinner pail
cark it
pass in one's checks
pay the debt of nature
depart
succumb
bite the dust
check out
keel over
pass on
quell
peg out
suck the kumara
cash in
cross the Styx
buy it
kick the bucket
meet one's end
slip one's wind
drop off the hooks
go home
meet one's doom
take a dirt nap
go
go belly-up
sputter out
pass
bite the big one
croak
cock one's toes
pop one's clogs
join the choir invisible
cop one's whack
draw one's last breath
flatline
peg it