departure
separation
for a change
retiral
off-ramp
decampment
withdrawalist
pretermination
withdrawalism
sabbatical
relinquished
withdrawingness
on the wing
get out while the getting's good
shrink
lapsed
absent
stand down
off like a bride's nightie
apopemptic
administrative leave
take a bow
punch out
walk away
off like a dirty shirt
retirement
reexit
go off
withdrawment
jet
climbdown
withdrawable
make like a tree and leave
trot off
make like a banana and split
umbedraw
haul tail
go about one's day
take one's leave
bust a move
go about one's business
on the way out
peace out
back down
French leave
go on one's merry way
take leave
take wing
cut one's stick
way-going