From Longman Dictionary of Contemporary Englishweed somebody/something ↔ out phrasal verbGET RID OFto get rid of people or things that are not very good The research will help governments to weed out ineffective aid schemes. → weed→ See Verb table
Examples from the Corpus
weed out• Remember that the main judges don't see the bulk of the entries because the competition organisers weed them out beforehand. 