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Meaning of unstop

un•stop

Pronunciation: (un-stop'), [key]
— -stopped, -stop•ping.
  1. to remove the stopper from: to unstop a bottle.
  2. to free from any obstruction; open: to unstop a sewer.
  3. to draw out the stops of (an organ).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.