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whistle-blower /(h)wɪsəl ˌbloʊ(ə)r/
a person who informs on a person or organization engaged in an illicit activity.
whistle-blowing - noun & adjective
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noun (plural conundrums)
a confusing and difficult problem or question: one of the most difficult conundrums for the experts.
• a question asked for amusement, typically one with a pun in its answer; a riddle.
1 the conundrums facing policy-makers: PROBLEM, difficult question, difficulty, quandary, dilemma; informal poser.
2 Rod enjoyed conundrums and crosswords: RIDDLE, puzzle, word game; informal brainteaser.
late 16th century: of unknown origin, but first recorded in a work by Thomas Nashe, as a term of abuse for a crank or pedant, later coming to denote a whim or fancy, also a pun. Current senses date from the late 17th century.