Out of print means that a book or any other written material is no longer being produced and available for purchase. There are several synonyms for this phrase, including discontinued, unavailable, extinct, and superseded. Discontinued means that the item is no longer being produced, while unavailable suggests that the item is temporarily out of stock. Extinct implies that the item is no longer in existence, while superseded means that the item has been replaced with a newer version. Other synonyms for out of print include obsolete, phased out, retired, and ended, all of which suggest that the item is no longer available for purchase.