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a tough nut to crack a problem or situation that is difficult to solve or cope with. [2 definitions]
crack a book to open a book and read it, or to discipline oneself to study.
crack down to increase the severity with which rules, laws, or the like are enforced, esp. to combat abuses or rectify a problem. [2 definitions]
crack up (informal) to break into uncontrollable laughter. [2 definitions]
crack-up a collision of a vehicle; crash. [2 definitions]
cracked wheat coarsely processed wheat.