What is Sift?

Sift definition and meaning on Dictionary terms:
verb (used with object)
to separate and retain the coarse parts of (flour, ashes, etc.) with a sieve.
to scatter or sprinkle through or by means of a sieve: to sift sugar onto cake.
to separate by or as if by a sieve.
to examine closely: The detectives are still sifting the evidence.

to question closely.

verb (used without object)
to sift something.
to pass or fall through or as if through a sieve.