Read this before 10 a.m.

Or you'll be shot. That's your deadline.

The word means:
1. A line around a military prison beyond which a prisoner may not go without risk of being shot.
2. A time limitation by which some task must be completed.Deadline, linguist Robert Beard writes, is made up of dead and line and originally referred to the line around a prison beyond which a prisoner could expect to be shot. The finality