Use 'spread the word' when you want people in a community or group to tell others news or information. There's a lost dog in our neighborhood; please spread the word.
Pro Tip 2/3
Personal Request
'Spread the word' often implies a personal request for help in telling others something important. My sister is raising funds for her project; can you spread the word?
Pro Tip 3/3
Call to Action
Used to prompt immediate sharing in order to quickly inform a wider audience. We need more volunteers—spread the word so we can find people fast!