unlock

Etymology

From Middle English unloken, unlouken, onlouken, from Old English onlūcan (“to unlock”), equivalent to un- + lock. Cognate with Dutch ontluiken (“to unlock”).

verb

1. (transitive) To undo or open a lock or something locked by, for example, turning a key, or selecting a combination.
   I unlocked the door and walked in.
2. (transitive) To obtain access to something; to meet the requirements of a security or protection system.
   I unlocked the dictionary article so I could edit it.
   This computer game is shareware, but you can pay for a code to unlock the full version.
   Plastics are energy-rich substances, which is why many of them burn so readily. Any organism that could unlock and use that energy would do well in the Anthropocene. Terrestrial bacteria and fungi which can manage this trick are already familiar to experts in the field. 2013-07-20, “Welcome to the plastisphere”, in The Economist, volume 408, number 8845
   The combination of the new station and road improvements is expected to unlock up to 14,000 new homes, with the council saying no more than 2,500 homes can be built at Beaulieu and north east Chelmsford without the station. 2019 October, “Funding for 20tph East London line service”, in Modern Railways, page 18
3. (transitive, mobile telephony) To configure (a mobile phone) so that it is not bound to any particular carrier.
4. (transitive) To disclose or reveal previously unknown knowledge or potential.
   The discovery of a clue unlocked the mystery.
   Twitter has extraordinary potential. I will unlock it. 2022-04-14, Rupert Neate, quoting Elon Musk, “Elon Musk offers to buy Twitter for more than $40bn”, in The Guardian
5. (intransitive) To be or become unfastened or unrestrained.
6. (figurative) To make available.
   He also warned of the supply chain issues, stating: "Don't pretend you're going to unlock half a dozen [electrification] schemes simultaneously because you'll probably flood the supply chain, we don't have the capacity." May 20 2020, Richard Clinnick, “Electrification key to decarbonisation”, in Rail, page 16
7. To undermine something that has control over a situation; to find a way to counter or oppose.
   Saka's cross unlocked a well-organised Ukraine defence for Kane to pounce and set England on their way before producing a superb piece of individual skill to effectively end the contest. March 26, 2023, Phil McNulty, “England 2-0 Ukraine”, in BBC Sport

noun

1. The act of unlocking something.
   Unlike modern, automated prisons, each cell here was locked and unlocked manually with a large skeleton key. The first duty was to get a proper head count of each inmate, insuring each was alive. Once done, an unlock was conducted. 1998, Steven Herberts, The Correctional Officer Inside Prisons, page 38
   The instructions between a lock and an unlock form a critical section. 2011, Ganesh Gopalakrishnan, Shaz Qadeer, Computer Aided Verification: 23rd International Conference