1. A person employed in a theater to summon actors when they are needed on stage.
Usage: theater/drama
2. A boy or young man employed to run errands or perform minor duties in a hotel, office, or similar establishment.
Usage: dated; chiefly British

Examples

• The callboy knocked on the dressing room door to alert the actor that his scene was coming up.
• In the old theater, the callboy was responsible for keeping track of all the actors' entrances.
• The callboy at the hotel helped guests with their luggage and messages.
• During the dress rehearsal, the callboy made sure every performer knew their cue.
• The stage manager relied on the callboy to maintain order backstage.