un stop


verb (used with object), unstopped, unstopping.
to remove the stopper from: to unstop a bottle.
to free from any obstruction; open: to unstop a sewer.
to draw out the stops of (an organ).

1350–1400; Middle English unstoppen. See un-2, stop

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World English Dictionary
unstop (ʌnˈstɒp)
vb , -stops, -stopping, -stopped
1.  to remove the stop or stopper from
2.  to free from any stoppage or obstruction; open
3.  to draw out the stops on (an organ)

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