chaff
1 n-uncount Chaff is the outer part of grain such as wheat. It is removed before the grain is used as food.
2 If you separate the wheat from the chaff or sort the wheat from the chaff, you decide which people or things in a group are good or important and which are not.
♦
separate the wheat from the chaff/sort the wheat from the chaff phrase V inflects
It isn't always easy to separate the wheat from the chaff.
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"