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sounding board

sounding board

 
pronunciation:
saUn dIng bord
part of speech: noun
definition 1: a thin board that forms part of the resonant chamber of a musical instrument such as a piano, and that enhances its tone.
definition 2: a structure above or behind a podium to reflect sound towards the audience.
definition 3: a person or group whose reactions to an idea or opinion are a reliable indicator of its general acceptability.