sift verb
1 pass sth through a sieve
ADV. finely Sift the flour finely before adding it to the mixture. | in, together Beat the mixture until smooth, then sift in the remaining sugar.
2 examine sth very carefully
ADV. carefully, methodically
PREP. through They spent days carefully sifting through the evidence.
You can also check other dicts: sift (English, 中文解释 ), wordnet sense, Collins Definition