relay
A new set of horses kept along a specific route so that they can replace animals that are tired.
Other meanings
A new set of anything.
A series of vehicles travelling in sequence.
Word history
From Old French "relaier" (to leave behind).
Where this comes from
This definition is adapted from “relay” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.