knee-strapn.(a) the strap used by a shoemaker to keep a boot in position on his knee;(b) U.S. ‘in a railroad-car, a wrought-iron facing to a knee-timber, connecting the end-sill and the stirrup or drawbar carry-iron’ ( Cent. Dict. 1890).
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the world > textiles and clothing > clothing > tailoring or making clothes > making footwear > [noun] > equipment or materials for > equipment > device for holding shoe or last steady
stirrupa1600
knee-strap1812
boot-clampa1877
1812 Sporting Mag.40 14 A significant dangle of my knee-strap.
a1892 W. WhitmanTo Working Men 6 The awl and knee-strap.