Burn the midnight oil
To work late into the night.

Bite off more than you can chew
To take on more work than you can handle.

Put your nose to the grindstone
To work hard and continuously.

Keep your eye on the ball
Stay focused on the task at hand.

Go the extra mile
To do more than what is expected.

In the same boat
In the same difficult situation as others.

Throw in the towel
To give up or quit.

Pull your weight
To do your fair share of work.

Climb the corporate ladder
To move up in position at work.

Hit the ground running
To start something and proceed at a fast pace.

Back to the drawing board
To start over because the previous attempt failed.

Learn the ropes
To learn how to do a particular job.

Bring home the bacon
To earn a living or salary.

By the book
To do something according to the rules.

On the back burner
To postpone or delay work.

Cut corners
To do something in the easiest or cheapest way, often compromising quality.

Get the ball rolling
To start something, especially a task or project.

Work around the clock
To work continuously without stopping.

Too many irons in the fire
To be involved in too many tasks or projects at once.

A tough nut to crack
A difficult problem or situation to deal with.