Definition of winnow out phrasal verb from the Oxford Advanced Learner's Dictionary

 

winnow out

 phrasal verb
phrasal verb
 
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Phrasal Verbs

winnow somebody out

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winnow somebody out of something

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winnow something out

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winnow something out of something

 
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(formal) to remove people or things from a group so that only the best ones are left synonym sift
See the Oxford Advanced American Dictionary entry: winnow out