- soundingboard
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sounding board
n.
1. Music.a. A thin board forming the upper portion of the resonant chamber in an instrument, such as a violin or piano, and serving to increase resonance.b. A structure placed behind or over a podium or platform to reflect music or a speaker's voice to an audience. Also called soundboard.2. A person or group whose reactions to an idea, opinion, or point of view serve as a measure of its effectiveness or acceptability.3. A device or means serving to spread or popularize an idea or a point of view.
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Universalium. 2010.