Hard-nut-to-crack Definition
    noun
  
 (idiomatic) A problem that is challenging to solve.
Wiktionary 
(idiomatic) A place, opportunity, etc. to which it is difficult to gain entry.
Wiktionary 
(idiomatic) An amount that is difficult to finance.
 Wiktionary 
Other Word Forms of Hard-nut-to-crack
Noun
Singular:
 hard-nut-to-crackPlural:
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