From Longman Dictionary of Contemporary Englishcrack itcrack itBritish English informalSUCCEED IN DOING something to manage to do something successfully I think we’ve cracked it! He seems to have got it cracked. → crack
Examples from the Corpus
crack it• A drawback of this fire-setting technique is that it was liable to impair the value of the product by cracking it.• Even some respected well-known all-round big-fish anglers have yet to crack it.• In the absence of mathematical proofs of security, nothing builds confidence in a cryptosystem like sustained attempts to crack it.• The grenade left his grip at almost the same moment as another beam struck him full across the carapace, cracking it.• When Bobbie went on struggling I pushed her head against the floor, wincing at the crack it made.• He stopped outside the kitchen door and carefully cracked it open a fraction - and looked straight into Jane's wide eyes. 