sounding board

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sound·ing board • n. 1. a board or screen placed over or behind a pulpit or stage to reflect a speaker's voice forward. ∎ another term for soundboard.2. a person or group whose reactions to suggested ideas are used as a test of their validity or likely success before they are made public: I considered him mainly as a sounding board for my impressions. ∎  a channel through which ideas are disseminated.

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