unblock
Word family (noun) block blockage blockade (adjective) blocked unblocked (verb) block unblock blockade
From Longman Dictionary of Contemporary Englishunblockun‧block /ʌnˈblɒk $ -ˈblɑːk/ verb [transitive] if you unblock a pipe, you remove something that is blocking itunblock a toilet/drain/chimney etc→ See Verb tableExamples from the Corpusunblock a toilet/drain/chimney etc• Watchdog featured her after she called out a plumber to her home to unblock a toilet.