Definitions of hard nut to crack:
- noun: Used other than figuratively or idiomatically: see hard, nut, crack.
- noun: (idiomatic) A problem that is challenging to solve.
- noun: (idiomatic, by extension) A situation, person, group, etc. which is difficult to overcome or deal with.
- noun: (idiomatic) A place, opportunity, etc. to which it is difficult to gain entry.
- noun: (idiomatic) An amount that is difficult to finance.
(Definitions from Wiktionary)
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