To 'lie down on the job' means to neglect to do something that you are responsible for or to fail to do your job properly. If you lie down on the job, it can also mean that you are not working as hard as you could be or resting or taking a break or shortcuts.

1. Alice is talented, but her lack of motivation means that she procrastinates a lot. If she continues to lie down on the job like this, she will be fired.
2. The head of the department was quick to point the finger at his staff for the low number of sales last month, accusing them of lying down on the job.

1. They left me to organise the party on my own. Everyone else was lying down on the job.
2. Looking after children is very hands-on. There is no opportunity to lie down on the job.