win ‧ now /ˈwɪnəʊ $ -noʊ/ BrE AmE ( also winnow down ) verb
[ Language: Old English ; Origin: windwian ]
[transitive] to make a list, group, or quantity smaller by getting rid of the things that you do not need or want SYN whittle down :
We need to winnow the list of candidates to three.
winnow somebody/something ↔ out phrasal verb
to get rid of the things or people that you do not need or want from a group