Hard-nut-to-crack definitions

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