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brain-teaser

British  

noun

  1. informal a difficult problem

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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This matters, Graham argues: “If this seem like a disproportionate reaction to a daily brain-teaser for dweebs, consider the role that puzzles play in solvers’ lives.

From Slate • Jun. 28, 2016

“Extraterrestrial” is a subtler and cooler film that does not aspire to be a brain-teaser in the same way.

From Salon • Jun. 16, 2012

It had been devised—by himself—as a brain-teaser for the amusement of other high-level scientific brains.

From The Machine That Saved The World by Leinster, Murray