relay in Greek

(athletics) A track and field discipline where runners take turns in carrying a baton from start to finish. The most common events are 4×100 meter and 4×400 meter competitions. [from 19th c.]

(electronics) An electrical actuator that allows a relatively small electrical voltage or current to control a larger voltage or current. [from 19th c.]

(transitive, now, _, rare) To place (people or horses) in relays, such that one can take over from another. [from 18th c.]