Drop-dead day

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Drop-dead day

The date on which a deadline is final, with no exceptions.

Drop-Dead Day

Informal; a firm deadline that one cannot miss. A drop-dead day is often the last day of the quarter or year by which financial figures must be reported.
References in periodicals archive ?
"We would like to have construction finished for Memorial Day, but we have a drop dead date in June," Reardon said.
Officials technically have just six days to hammer out a new deal before the "drop dead date" of September 1 on which the contractor could pull the plug on the whole project and demand full payment of their costs.
You tried to soften that by saying you would take another look at the issue at the end of the year, but everyone ignored that and let you know that January 1 was the drop dead date to solve all the negotiating problems with Iran.