Swingle n. A wooden instrument like a large knife, about two feet long, with one thin edge, used for beating and cleaning flax; a scutcher; called also swingling knife, swingling staff, and swingling wand.
... flax. You grow it an' when it is grown you pull it clean up out of de groun' till it kinder rots. Dey have what dey called a brake, den it wuz broke up in dat. De bark wuz de flax. Dey had a stick called a swingle stick, made kinder like a sword. Dey used dis to knock de sticks out o' de flax. Dey would den put de flax on a hackle, a board wid a lot of pegs in it. Den dey clean an' string it out till it looks lak your hair. Dey flax when ... — Slave Narratives: a Folk History of Slavery in the United States From Interviews with Former Slaves, North Carolina Narratives, Part 2 • Works Projects Administration