unblock

un- +‎ block

• IPA^(key): /ʌnˈblɒk/
• Rhymes: -ɒk

unblock (third-person singular simple present unblocks, present participle unblocking, simple past and past participle unblocked)

1. (transitive) To remove or clear a block or obstruction from.

   Synonym: deobstruct

   We need a plumber to unblock the sink.

   • 2021 March 10, “Network News: Flooding closes Highland and West Coast main lines in Scotland”, in RAIL, number 926, page 17:

     During this period, Network Rail was able to unblock a culvert and stabilise a high-risk landslip at Beattock, and to stabilise a high-risk landslip site at Ravenstruther (near Carstairs).

2. (transitive) To free or make available.
   • 2010, Syed Ali, Dubai: gilded cage, page 58:

     It is not just bad news about Dubai that gets blocked from the Internet; […] a whole range of other social networking sites have been blocked, unblocked and reblocked.

3. (intransitive, card games) In whist, to throw away a high card so as not to interrupt one's partner's long suit.
4. (transitive) To enable communication again, via telephone, instant messaging, etc., with (somebody previously blocked).