Hypertext Webster Gateway: "unclog"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Unclog \Un*clog"\, v. t. [1st pref. un- + clog.]
To disencumber of a clog, or of difficulties and
obstructions; to free from encumbrances; to set at liberty.
--Shak.
From WordNet (r) 1.7 (wn)
unclog
v : become or cause to become unobstructed; "The chemical that
we poured down the drain unclogged it" [ant: {clog}]
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