A vivid American dialectal expression from the South for a torrential downpour — rain so heavy it could float lightwood knots (the dense, resin-soaked heart of pine trees, famously heavy and difficult to move) off the ground. The phrase captures the hyperbolic Southern tradition of describing extreme weather.
It came down a regular lightwood-knot floater that afternoon, and the creek was over its banks by nightfall.
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(US, dialectal) A very heavy downpour of rain.
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