[uhn-klog, -klawg]
verb (used with object), unclogged, unclogging.
to free of an obstruction or impediment: to unclog a drain; to unclog rush-hour traffic.
verb (used without object), unclogged, unclogging.
to become unclogged: I can't wash the dishes until the drain unclogs.

1600–10; un-2 + clog

unclogger, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unclog (ʌnˈklɒɡ)
vb , -clogs, -clogging, -clogged
(tr) to remove an obstruction from (a drain, etc)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Reward patient capital in start-ups could unclog small business investment.
Until you correct the mistrust and fear that prevents financial firms from
  engaging with one another, you can't unclog the system.
Whether it might be used to remove gravy stains or unclog a drain remains
They stuck a wire through the valve to unclog it, but still nothing happened.
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