borrowed from French, literally, "(it) strikes down (abat) the voice (voix)," from abattre "to strike down" + voix "voice," going back to Old French vois
1872, in the meaning defined above
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“Abat-voix.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/abat-voix. Accessed 4 Dec. 2023.
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