RELAYS

To lay (for example, flooring or railroad track) again.

"He had to re-lay the tiles because the cement was too dry."

A new set of hounds.

A new set of horses kept along a specific route so that they can replace animals that are tired.

(by extension) A new set of anything.

To release a new set of hounds.

To place (people or horses) in relays, such that one can take over from another.

To take on a new relay of horses; to change horses.