put a shift in

hard at work

Labouring with great effort and diligence; working hard.

apply oneself

Synonym of strive: to work hard, to complete an activity with good eff…

bust one's balls

To work very hard; to put in a lot of effort.

elbow grease

Effort or hard work, especially physical work involving repeated motio…

work back

to work overtime; to make up time off by working overtime; to work bey…

run someone ragged

To exhaust; to demand excessive effort or work from somebody.