[ verb ] move as if through a sieve
"The soldiers sifted through the woods"
[ verb ] separate by passing through a sieve or other straining device to separate out coarser elements
"sift the flour"
Used in print(William C. Smith, "Why Fear Ideas?"...)
Frequently we are given assurance that automatically all ideas will be sifted and resifted and in_the_end only the good ones will survive .