ˈdeafeningn. material used for this purpose, pugging: deafening-board, a board fixed between floor-joints to prevent sound from passing through the floor.
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1839 M. LafeverMod. Archit. 111 Strips nailed on the sides of the beams, to support the deafening board.
1864 Glasgow Herald 9 Apr. The heavy load of earth which has been put in for deafening.