john started keeping time on the doomsday clock after his boss had told him he'd be fired if he hadn't finished all of his paperwork before 6pm on friday
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
"john started keeping time on the doomsday clock after his boss had told him he'd be fired if he hadn't finished all of his paperwork before 6pm on friday" What is the definition of "doomsday clock"?