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Intelligence. In medicine, gray matter is tissue in the brain and spinal cord. Come on in—we could use your gray matter as we try to solve this problem.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Fig. intelligence; brains; power of thought. Use your gray matter and think what will happen if the committee resigns. Surely they'll come up with an acceptable solution if they use some gray matter.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Brains, intellect, as in If you'd only use your gray matter, you'd see the answer in a minute. This expression refers to actual brain tissue that is gray in color. Agatha Christie's fictional detective, Hercule Poirot, constantly alludes to using the little gray cells for solving a crime. [Late 1800s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ˈgrey matter(informal) intelligence or mental powers: Mark hasn’t got much grey matter, but he tries hard.
Farlex Partner Idioms Dictionary © Farlex 2017