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slope-board
slope-board adj.
Brit. 
/ˈsləʊpbɔːd/
, /ˈsləʊpbɔːd/U.S. /ˈsloʊpˌbɔrd/
/ˈsloʊpˌbɔrd/Π
1648 H. Hexham Groot Woorden-boeck at Galm The Slope-board-windowes in a Steeple of Bells, to give them the better sound.
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as lemmas