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A timepiece that counts down to the exact time of a deadline, failing to complete a certain task by the end of that deadline will result in dire consequences. May refer to a metaphorical doomsday clock i.e. watching an actual clock and doing the math to see how much time you have left. Or a physical doomsday clock like the ones that were sold in the lead up to the millennium or the ones featured on bombs that explode once they reach zero.
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