Tough-nut-to-crack meaning

(idiomatic) A place, opportunity, etc. to which it is difficult to gain entry.
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Used other than as an idiom: see tough,‎ nut,‎ crack.
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(idiomatic) A problem that is challenging to solve.
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(idiomatic, by extension) A situation, person, group, etc. which is difficult to deal with.
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The definition of tough nut to crack is someone who it is hard to get close to, hard to get to know or hard to understand.

An example of a tough nut to crack is a mysterious friend you have who never really opens up about herself or lets you get close.

adjective
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An amount that is difficult to finance.
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