drop-dead deadline
n.— «More than 7,000 Americans already have fled the area and the U.S. was prepared to take another 3,000 out this weekend in what has been referred to as “drop-dead deadline” to leave the area.» —“Israeli troops raid village in Lebanon” by Jennifer Walters MarketWatch July 22, 2006. (source: Double-Tongued Dictionary)
Further reading
The word filibuster has a long and colorful history, going back to the days when pirates roamed the high seas. Today it refers to hijacking a piece of legislation. Plus, the language of yoga teachers: When doing a guided meditation, you may hear...
An anadrome is a word that forms a whole new word when you spell it backwards. For example, the word “stressed” spelled backwards is “desserts.” Some people’s first names are anadromes. There’s the girl named Noel...