overworking
overwork
exploit
overlabour
overstay
workaholism
overpayment
overworked
overpronation
keep one's nose to the grindstone
keep one's shoulder to the wheel
peg away
plug away
slog
slogging
worksome
overemployment
work one's fingers to the bone
pass
overburden
flameout
forset
overspend
laxening
workaholic
skimp
overlaboured
scant
overdrift
ultralaborious
overfastidiousness
workaholicism
overhire
overoptimization
superserviceable
sweaty
overruff
run someone off their feet
all work and no play makes Jack a dull boy
overpay
outwork
slacking
shirking
go
goldbricking
collar-work
goofing off
soldiering
grunt work
layoff