World English Dictionary
brain-teaser or brain-twister
informal a difficult problem
brain-twister or brain-twister

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Slang Dictionary

brain-twister definition

and brain-teaser
  1. n.
    a puzzle, especially one that requires thinking. : Can you help me with this brain-teaser? , I can spend my whole vacation doing brain-twisters.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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