Answer:
An Americanism dating back to 1935–40; chalk + board
Chalk: before 900; Middle English chalke, Old English cealc < Latin calc- (stem of calx ) lime
Board: before 900; Middle English, Old English bord board, table, shield; cognate with Dutch boord board, bord plate, German Bort, Old Norse borth, Gothic -baurd
A. Cutter
I chose cutter because a saw cuts wood and doesn't smooth or hold it.
Does that make sense?
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