To put (a fine, loose, or powdery substance) through a sieve so as to remove lumps or large particles. She sifted the flour into the bowl to ensure there were no clumps.
To examine (something) thoroughly so as to isolate that which is most important or useful. The detective sifted through the evidence to find the crucial clue.
To scatter or sprinkle (a substance) over a surface. The baker sifted sugar over the freshly baked pastries.
To pass or flow gradually through or as if through a sieve. Fine sand sifted slowly through the hourglass.