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
Silence comes in many forms. Writer Paul Goodman says there is, for example, the noisy silence of “resentment and self-recrimination,” and the helpful, participatory silence of actively listening to someone speak. • The strange story...
How colors got their names, and a strange way to write. The terms blue and orange arrived in English via French, so why didn’t we also adapt the French for black and white? • Not every example of writing goes in one direction across the page...