1. a person who helps actors by quietly telling them their lines when they forget during a performance
Usage: theater
2. a person or thing that encourages or causes someone to take action

Examples

• The prompter sat hidden behind the stage curtain during the play.
• When the lead actor forgot his lines, the prompter whispered them quietly.
• The theater hired an experienced prompter for the amateur production.
• Her conscience served as a prompter to do the right thing.
• The deadline was a powerful prompter for completing the project.
• The teacher acted as a prompter, encouraging students to participate in class discussions.