See also: Dutchman
From Dutchman. Attested mainly in the US from the late 19th century.
dutchman (plural dutchmen)
- (carpentry, masonry) A piece of wood or stone used to repair a larger piece, shaped such that it fills as exactly as possible a void or cavity that is to be repaired.
- A flaw or void repaired with such a piece.
- Oxford English Dictionary, 1884–1928, and First Supplement, 1933.
- John Russell Bartlett (1884) Dictionary of Americanisms, page 196: “Dutchman. A flaw in a stone or marble slab, filled up by an insertion.”