—n. 1. a question or statement so framed as to exercise one's ingenuity in answering it or discovering its meaning; conundrum.
2. a puzzling question, problem, or matter.
3. a puzzling thing or person.
4. any enigmatic or dark saying or speech.
—v.t. 1. to pierce with many holes, suggesting those of a sieve: to riddle the target. 2. to fill or affect with (something undesirable, weakening, etc.): a government riddled with graft. 3. to impair or refute completely by persistent verbal attacks: to riddle a person's reputation. 4. to sift through a riddle, as gravel; screen.
—n. a coarse sieve, as one for sifting sand in a foundry.