Collins COBUILD Advanced Learner's English Dictionary - chaff

1. Chaff is the outer part of grain such as wheat. It is removed before the grain is used as food. N-UNCOUNT 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. It isn’t always easy to separate the wheat from the chaff. PHRASE: V inflects