If someone says something in a stage whisper, they say it as if they are speaking privately to one person, although it is actually loud enough to be heard by other people.
stage whisper in British English
noun
1.
a loud whisper from one actor to another on stage intended to be heard by the audience
2.
any loud whisper that is intended to be overheard
stage whisper in American English
1.
a loud whisper by an actor on the stage, heard by the audience but supposed not to be heard by other actors on stage
2.
any similar loud whisper meant to be overheard
Examples of 'stage whisper' in a sentence
stage whisper
`It's not that," Wanna said more-or-less in a stage whisper.
Keene, Carolyn THE SECRET OF THE FORGOTTEN CITY (1999)
Larry leant towards her, reducing his voice to a stage whisper.
Pacter, Trudi YELLOW BIRD (1999)
`Sylvia," she told him in a discreet stage whisper behind my back.
Pickard, Nancy NO BODY (1999)
"She dropped her voice to something approaching a stage whisper.