stage whisper

From King Dictionary of Contemporary English
Related topics: Theatre
stage whisperˌstage ˈwhisper noun [countable] 1 APTa loud whisper used by an actor in a play, which the other actors on the stage seem not to hear2 SAYa loud whisper that is intended to be heard by everyone
Examples from the Corpus
stage whisperHe dropped to a conspiratorial stage whisper with Margaret: Where is she anyway?