drop-dead date(redirected from a drop dead date)
The definitive date by which something needs to be completed; the deadline. I just found out that tomorrow is the drop-dead date for this project, so we really need to finish things up. I haven't found the right candidate for the job yet, and the boss's drop-dead date is rapidly approaching.
See also: date
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.