unstop

from The Collaborative International Dictionary of English v.0.48

Unstop \Un*stop"\, v. t. [1st pref. un- + stop.]
   [1913 Webster]
   1. To take the stopple or stopper from; as, to unstop a
      bottle or a cask.
      [1913 Webster]

   2. To free from any obstruction; to open.
      [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

31 Moby Thesaurus words for "unstop":
      bare, clear, deobstruct, disclose, expose, free, manifest, ope,
      patefy, reveal, unblock, uncase, unclench, unclog, unclutch,
      uncork, uncover, uncurtain, undo, undrape, unfold, unfoul, unlatch,
      unlock, unplug, unroll, unseal, unsheathe, unshut, unveil,
      unwrap

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