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
In 1916, a small-town newspaper in Pennsylvania printed a fanciful item about a local gathering with a guest list that included, among others, Miss Ella Vader, Mr. Ray Zor, and other punny names. This is part of a complete episode. Transcript of...
The Great Passage is an anime about a young man who steps up to take over a project to edit a new dictionary, eventually becoming a full-fledged lexicographer. This is part of a complete episode. Transcript of “Anime About Dictionaries” You and I...