1. A difficult problem (synset 106798080)
  2. A coarse sieve (as for gravel) (synset 104095808)
  1. Pierce with many holes (synset 201277865)
    "The bullets riddled his body"
  2. Set a difficult problem or riddle (synset 200624678)
    "riddle me a riddle"
  3. Separate with a riddle, as grain from chaff (synset 201463414)
  4. Spread or diffuse through (synset 201231635)
    "An atmosphere of distrust has permeated this administration"; "music penetrated the entire building"; "His campaign was riddled with accusations and personal attacks"
  5. Speak in riddles (synset 200744020)
  6. Explain a riddle (synset 200637376)

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