relay

Electrical device such that current flowing through it in one circuit can switch on and off a current in a second circuit.

A race between teams; each member runs or swims part of the distance.

A crew of workers who relieve another crew.

A fresh team to relieve weary draft animals.

The act of passing something along from one person or group to another.

“the relay was successful”

Control or operate by relay.

Pass along.

“Please relay the news to the villagers”