A sieve with coarse meshes, usually of wire, for separating coarser materials from finer, as chaff from grain, cinders from ashes, or gravel from sand.(noun)
source: webster1913
Something proposed to be solved by guessing or conjecture; a puzzling question; an ambiguous proposition; an enigma; hence, anything ambiguous or puzzling.(noun)
source: webster1913
verb (v)
pierce with many holes(verb.contact)
Example: The bullets riddled his body.
source: wordnet30
set a difficult problem or riddle(verb.cognition)
Example: Riddle me a riddle.
source: wordnet30
separate with a riddle, as grain from chaff(verb.contact)