flatline
go to sleep
cash in
liquidate
go home
go the way of all the earth
neutralize
knock off
do
pass in one's checks
pay the debt of nature
slot
bite the big one
86
kill0r
cash in one's chips
hand in one's dinner pail
off
kick
yoink
sputter out
go belly-up
extinguish
fall off one's perch
slip one's wind
stiff
join the choir invisible
hand in one's checks
cack
dust
croak
depart
succumb
demise
draw one's last breath
peg it
bite the biscuit
pop one's clogs
settle
khalass
pass the river
cool
cross the Styx
check out
go out
go
finish off
drop off the hooks