[n] a strainer for separating lumps from powdered material or grading particles
[v] distinguish and separate out; "sift through the job candidates"
[v] separate by passing through a sieve or other straining device to separate out coarser elements; "sift the flour"
[v] check and sort carefully; "sift the information"
[v] examine in order to test suitability; "screen these samples"; "screen the job applicants"