What does Deadstock mean?

In the past, deadstock was used to declare a sneaker that was no longer for free sale - i.e. a sold out sneaker. Nowadays this term is used more to describe the unworn / new condition of a sneaker. Abbreviated as "DS". Mostly the term "DS" is used for a sale, purchase or exchange. There is also the abbreviation "DSWT" (Deadstock Sneaker with tags) with the same meaning.