'Weed out' definitions:

Definition of 'weed out'

(from WordNet)
verb
Remove unwanted elements; "The company weeded out the incompetent people"; "The new law weeds out the old inequities" [syn: weed out, comb out]

Definition of 'Weed out'

From: GCIDE
  • Weed out \Weed out\, v. t. to selectively remove; same as weed[2], v. t.; -- of things that are useless or harmful. [PJC]