[with obj.]undo the lock of (something) using a key 用钥匙开锁 he unlocked the door to his room. 他打开了房门锁。 ■make (something previously inaccessible or unexploited) available for use 利用(原先无法得到之物) the campaign has helped us unlock rich reserves of talent among our employees. 竞赛帮我们打开了员工丰富的智慧储备。