winnow

To separate the chaff from (grain) by means of a current of air.

To blow (chaff) off or away.

To examine closely in order to separate the good from the bad; sift.

To separate or get rid of (an undesirable part); eliminate.

To sort or select (a desirable part); extract.

To blow on; fan.

To separate grain from chaff.

To separate the good from the bad.

A device for winnowing grain.