winnow down
Advanced (C1)neutral
To sort through a big group and get rid of the ones that don't make the cut, leaving only the best.
"The committee winnowed down three hundred applications to a shortlist of twelve."
Hear it in context

Baseball Dictionary with George Brett, Pete Fairbanks, and Tim Kurkjian | Sources Tell Jeff Passan
ESPN MLB · 1:26
to callull through and winnow down to a manageable number.

Panthers Live Press Conference
Carolina Panthers · 30:31
of winnow down what you're looking for in a player at all?