cross the Styx
toddle off
go belly-up
sputter out
slip one's wind
join the choir invisible
pay the debt of nature
demise
croak
quell
bite the dust
snuff it
cop one's whack
fall off one's perch
pop one's clogs
cock one's toes
hand in one's dinner pail
go out
pass the river
expire
succumb
buy it
go to sleep
cark it
depart
go home
peg out
go
go the way of all the earth
keel over
cash in
peg it
pass away
pass on
meet one's end
turn to dust
pass in one's checks
commit suicide
conk out
slay
waste
-cide
duppy
on the way out
return to dust
put away
Paraguay tea
grease
pop off