riddle : Idioms & Phrases
james riddle hoffa
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noun United States labor leader who was president of the Teamsters Union; he was jailed for trying to bribe a judge and later disappeared and is assumed to have been murdered (1913-1975)
Jimmy Hoffa; Hoffa.
WordNet
riddle canon
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noun a canon in which the entrances of successive parts were indicated by cryptic symbols and devices (popular in the 15th and 16th centuries)
enigmatic canon; enigmatical canon; enigma canon.