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 ?
These projects come with the ultimate drop dead date - one you simply can't push back, or buy relief from.
Despite closing dates, cut off dates, drop dead dates and other dates that announce that we have to "complete" and "finish" the guide, we are never finished.