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separate the chaff from by using air currents;
"She stood there winnowing chaff all day in the field"
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blow on;
"The wind was winnowing her hair"
"the wind winnowed the grass"
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select desirable parts from a group or list;
"cull out the interesting letters from the poet's correspondence"
"winnow the finalists from the long list of applicants"
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blow away or off with a current of air;
"winnow chaff"