unblock

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unblock

(ŭn-blŏk′)
tr.v. un·blocked, un·blocking, un·blocks
To remove or clear an obstruction from: unblock a road; unblock an artery.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.