[n] the act of separating grain from chaff; "the winnowing was done by women"
[v] remove by a current of air, as of chaff
[v] treat by exposure to a current of air so that waste matter is eliminated, as of grain
[v] separate from chaff; of grain; "She stood there winnowing all day in the field"
[v] blow on; "The wind was winnowing her hair"