Deadline, /ded.laIn/, noun

1 : a line drawn within or around a prison that a prisoner passes at the risk of being shot
2 a : a date or time before which something must be done

I like the first one better.

For future reference, is something was due August 31st and I escalate the issue to your boss, don't give me hurt puppy dog eyes and ask why I was talking to them when this is your responsibility. Particularly when I have five unreturned phone calls on my damned phone log. I'm pushing for the shooting.