a hard egg to crack

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a hard egg to crack

A person, thing, situation, or problem that is particularly difficult to understand, solve, or deal with. I've been dating Jenny for over a year, and I still think she's a hard egg to crack! Figuring out the best way to modernize our product without alienating existing customers is definitely a hard egg to crack. The spy we captured is a hard egg to crack—he hasn't said a thing since we began the interrogation.
See also: crack, egg, hard