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

 

sift out

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1to remove something that you do not want from a substance by putting it through a sieve Put the flour through a sieve to sift out the lumps.
  2. 2to separate something, usually something you do not want, from a group of things We need to sift out the applications that have no chance of succeeding.
See the Oxford Advanced American Dictionary entry: sift out