Verb
sift out (third-person singular simple present sifts out, present participle sifting out, simple past and past participle sifted out)
(idiomatic) To isolate or identify one particular thing from a collection that includes less relevant things.
You cannot sift out the poor from the community. The poor are indispensable to the rich. Henry Ward Beecher
All you need do is listen to very smart people and sift out the ideas that are unworthy or implausible, and I wouldn't pretend for a moment that I hadn't made lots of mistakes and there are companies, perhaps, that we had been investors in. Michael Moritz