Synonyms of 'winnow'
phrasal verbwinnow something or someone out
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If a border or line divides two areas or divides an area into two, it keeps the two areas separate from each other.
the artificial line that divided the city
If you fan yourself or your face when you are hot, you wave a fan or other flat object in order to make yourself feel cooler.
She fanned herself with a piece of cardboard.
Thesaurus for winnow from the Collins English Thesaurus
If you winnow a group of things or people, you reduce its size by separating the ones that are useful or relevant from the ones that are not.