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Winnowing is a method of separating grain from chaff. It involves throwing the mixture into the air so that the wind blows away the lighter chaff, while the heavier grains fall back down for recovery. A hand-driven wooden winnower is still used on small farms to prepare grain for sowing.

Comments  

You copied thats second sentence from Wikipedia, unless it was you who wrote it there in the first place.

The English is OK, but I always thought that you winnowed to prepare gain for eating, not sowing.

For both eating and sowing:)