Meaning of “sift” - Learner’s Dictionary

sift

verb [ T ] uk us /sɪft/
FOOD

to put flour, sugar, etc through a sieve (= wire net shaped like a bowl) to break up large pieces:

Sift the flour into a large bowl.
LOOK CAREFULLY (also sift through)

to carefully look at every part of something in order to find something:

to sift through evidence

(Definition of “sift” from the Cambridge Learner’s Dictionary © Cambridge University Press)