noun 1.a
boy or man who summons actors, as from their dressing rooms, shortly before they are due to go on stage.
3.Also, call boy. a male prostitute who arranges appointments with clients by telephone.
4.Also, call-boy, call boy. Railroads Slang. a railroad employee responsible for ensuring that members of a train crew are on hand for their regular runs and for notifying them of an extra run.