In plain words
The moment people greet those near them with “Peace be with you.” A nod or smile is enough.
The fuller definition
The moment in the service when people greet those near them with “Peace be with you,” usually before communion. A handshake, a nod or a smile is enough. It comes from Jesus’ greeting to his disciples after the resurrection.
Where it comes from
John 20:19–21
In Sunday worship: The parts of a service, daily prayer, and the things you see in a church.