Noun, Temporal:

Designates the approximate point in time at which work begins in earnest; employee motivation is frequently observed to be "dead" before the deadline draws near.

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A line drawn within or around a prison that a prisoner passes at the risk of being shot.

The point at which work should held until, and then handed over to others all in one go.

A deadline refers to a practice in earlier prison camps which were usually farms and therefore had no real fences and so the deadline was literally a perimeter line that if you crossed you would be shot and most likely killed.

Noun:

See deadline.

Etymology: At the end of WW 2, when the British were about to overrun the German Nazi's, the Nazi's often sought to eliminate all evidence of their crimes in the internment camps. This evidence also included the prisoners. They were put in a line and killed, which had to be done before the British arrived.