winnow, winnowing, sifting -- (the act of separating grain from chaff; "the winnowing was done by women")
Overview of verb winnow
The verb winnow has 4 senses
winnow, fan -- (separate the chaff from by using air currents; "She stood there winnowing chaff all day in the field")
winnow -- (blow on; "The wind was winnowing her hair"; "the wind winnowed the grass")
cull out, winnow -- (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")
winnow -- (blow away or off with a current of air; "winnow chaff")