unblock
verb [ T ] uk/ʌnˈblɒk/ us/ʌnˈblɑːk/
疏通;扫除…的障碍
to clear something by removing something that is blocking it
to unblock a pipe/drain/toilet 疏通管道／水沟／厕所
He's having an operation to unblock two of his arteries. 他正在接受手术，疏通两条动脉。
（电话，网站等）解锁
to make it possible to use a phone, website, etc. again
Learn how you can unblock a phone number or remove it from the Auto Reject List. 学习如何给一个电话号码解锁，或是将它从自动拒绝名单上移除。