Usually means: Difficult problem or person solving.
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We found 4 dictionaries that define the word tough nut to crack:

General (2 matching dictionaries)
  1. tough nut to crack: Wiktionary
  2. tough nut to crack: Dictionary.com

Miscellaneous (1 matching dictionary)
  1. tough nut to crack: Idioms

Slang (1 matching dictionary)
  1. tough nut to crack: Urban Dictionary

Definitions from Wiktionary (tough nut to crack)

noun:  Synonym of hard nut to crack

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Words similar to tough nut to crack

Usage examples for tough nut to crack

Idioms related to tough nut to crack

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