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hard nut to crack
Slang Dictionary

nut definition


  1. n.
    an odd or strange person; a crazy person. : Some nut is going to try to fly from the top of one building to another.
  2. n.
    [one's] head. : The baseball came in fast. Clonk! Right on the nut!
  3. n.
    an enthusiast (about something). : Paul is a nut about chocolate cake.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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American Heritage
Idioms & Phrases

hard nut to crack

Also, tough nut to crack. A difficult problem; also, an individual who is difficult to deal with. For example, This assignment is a hard nut to crack, or It won't be easy getting her approval; she's a tough nut to crack. This metaphoric expression alludes to hard-shelled nuts like walnuts. [Early 1700s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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