Meanings
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1
verb
to clear a blockage from an opening, pipe, or passage
A plumber was called to unstop the blocked drain.
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2
verb
to remove a stopper, plug, or cork from a container or opening
She used a corkscrew to unstop the bottle.
Thesaurus
Etymology
From Middle English unstoppen, formed from the reversing prefix un- + stop. It can reverse either stopping as blockage or stop as the act of closing an opening with a plug.