lay down date
n.— «Booksellers have been required to refrain from selling the book until then, in what is known as a “lay down” date in the publishing world, a tactic typically used for giant best-selling books such as the latest Harry Potter book.» —“Marketing machine for Fiorina book begins” by Therese Poletti Mercury News (San Jose, California) Oct. 5, 2006. (source: Double-Tongued Dictionary)
Further reading
She sells seashells by the seashore. Who is the she in this tongue twister? Some claim it’s the young Mary Anning, who went on to become a famous 19th-century British paleontologist. Dubious perhaps, but the story of her rise from seaside...
One of the most powerful words you’ll ever hear — and one of the most poignant — isn’t in dictionaries yet. But it probably will be one day. The word is endling, and it means “the last surviving member of a species.” The...