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.-a board having a row of pins, set zigzag, between which wire is drawn to straighten it.-to separate, as grain from the chaff, with a riddle; to pass through a riddle; as, riddle wheat; to riddle coal or gravel.-to perforate so as to make like a riddle; to make many holes in; as, a house riddled with shot.-something proposed to be solved by guessing or conjecture; a puzzling question; an ambiguous proposition; an enigma; hence, anything ambiguous or puzzling.-to explain; to solve; to unriddle.-to speak ambiguously or enigmatically.