[with obj.] blow a current of air through (grain) in order to remove the chaff
扬（谷），簸。
remove (chaff) from grain
除去（谷物）的壳
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women winnow the chaff from piles of unhusked rice. 女人们把成堆成堆的剥壳稻谷扬去谷壳。
reduce the number in a set of (people or things) gradually until only the best ones are left
筛选，选取（人，物）
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the contenders had been winnowed to five. 经过筛选，竞争者剩下五名。
find or identify (a valuable or useful part of something)
发现；辨别（某物有价值或有用之处）
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amidst this welter of confusing signals, it's difficult to winnow out the truth. 在一堆杂乱无章的信号之中，要辨别真相很困难。
identify and remove (the least valuable or useful people or things)
辨别并剔除（最无价值或用处者）
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guidelines that would help winnow out those not fit to be soldiers .将有助于剔除那些不适合当兵之人的准则。
[no obj.]
〈诗／文〉 （风）吹
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the autumn wind winnowing its way through the grass .秋风一路轻拂草地。
[with obj.](of a bird)fan (the air) with wings
（鸟）用翼扇动（空气）。
"Old English