Amazon PPC glossary
Wind-down
The deliberate discontinuation of a product, as distinct from a temporary stock gap, which removes most of the reasons for restraint that apply to a product with a future to protect.
Where it matters most: Book 5, The Advanced PPC Clarity Guide, in the chapter “Advertising a Product That Is Out of Stock or Winding Down.”
Go deeper
The glossary gives you the one-line answer. The Advanced PPC Clarity Guide explains why it matters and what to do about it.