crack it
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. → crackExamples from the Corpuscrack 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.• 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.