Definition of "unstopper"

unstopper

verb
third-person singular simple present unstoppers, present participle unstoppering, simple past and past participle unstoppered
1. (transitive) To remove the stopper from.
  Quotations
  That night the whisky was unstoppered and Bradly lolled in bed, smoking, and betimes sweeping out an arm of conquest for his nobbler and taking a lordly pull at it.
  1938, Norman Lindsay, Age of Consent, 1st Australian edition, Sydney, N.S.W.: Ure Smith, published 1962, page 57