unblockverb [ T ]
/ʌnˈblɒk//-ˈblɑːk/to clear something by removing something that is blocking it:
to unblock a pipe/drain/toilet
He's having an operation to unblock two of his arteries.
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.